# LabyMod Discord Bug Report **Channels:** #support, #general, #discussions **Period:** 2026-06-07 13:01 – 2026-06-10 13:05 (UTC, 72h) **Messages analyzed:** 1594 | **Incidents:** 27 (18 open/active, 9 apparently fixed) **Changelogs checked:** Launcher 3.0.8, LabyMod 4 4.5.5, LabyFabric 2.0.12, LabyForge 2.0.2 --- ## πŸ”΄ Critical ### [CRIT-001] LabyForge 1.8.9 β€” any external mod crashes the game ⚠️ REGRESSED - **Category:** Client - **Component:** LabyForge - **(Crash)logs:** https://paste.labymod.net/raw/jaxemiwaxisomihazede Β· attachments/1514042642512478348_message.txt Β· attachments/1514046905976361020_message.txt - **Message Links:** https://discord.com/channels/260471731809026048/260471731809026048/1514042153045721179 Β· https://discord.com/channels/260471731809026048/260471731809026048/1514234874742046790 - **Occurrences:** 2 (both new this run) - **OS:** Windows 11 - **MC Version:** 1.8.9 - **Affected users:** @Torsv, @! REXO ☁ - **Status:** open β€” **Forge Loader 2.0.2 (09.06, "Fixed an issue where some mods were not loading properly") did NOT hold** **User reports:** > "it seems to crash whenever i have ANY outside mod enabled β€” i tried cherrypicking the mods, disabling and only enabling single ones but literally none of them will launch" β€” @Torsv, 2026-06-09 > "there is a problem with labymod 1.8.9 forge, every mod i add it crash the game […] it was the 'forge loader', it's broken" β€” @! REXO ☁, 2026-06-10 **Log analysis:** Torsv (1.8.9 + SkyblockAddons/ReplayMod/OptiFine): every external mod fails class transformation β€” `ClassNotFoundException: net.minecraft.entity.Entity` inside mod ASM transformers; `Error loading class` for skyblockaddons/replaymod/optifine classes. REXO (**labyforge 2.0.2 installed**, RTX 4060, Java 21): `NoClassDefFoundError: gnu/trove/map/hash/TByteObjectHashMap` β€” trove4j is a stock 1.8.9 Forge library, so the Forge runtime classpath is incomplete under LabyForge 2.0.x. Crash report even fails to resolve the current language (LanguageManager null) β†’ very early bootstrap failure. **Hypothesis:** LabyForge 2.0.x (the "4.5.0 Update" line) broke 1.8.9 class lookup/classpath assembly for external mods. REXO crashed on 06-10 **with 2.0.2 already installed** and Torsv reproduced on the snapshot channel after the 2.0.2 release β€” treat the 2.0.2 fix as ineffective for 1.8.9. Torsv's two logs were forwarded to the client dev by Northernside on 06-09 23:24. --- ## 🟠 High ### [HIGH-001] LabyFabric remapper aborts on existing remapped jar β€” game won't start πŸ†• ⚠️ REGRESSED - **Category:** Client - **Component:** LabyFabric - **(Crash)logs:** https://paste.labymod.net/raw/upizososoqurixukuber - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1514254090777923696 - **Occurrences:** 1 - **OS:** Windows - **MC Version:** 1.21.11 - **Affected user:** @UnimogTHW - **Linked Ideas:** [#20949 β€” Remapping cache doesn't delete old mod versions [DONE]](https://laby.net/ideas/20949) - **Status:** open β€” **UNANSWERED in #support** (reported 06-10 13:05, last message of the window) **Log analysis:** `java.io.UncheckedIOException: Failed to remap mods` ← `FileAlreadyExistsException: …\loader\fabric\1.21.11\remapped\voicechat-fabric-1.21.11-2.6.18-remapped-454f7503d95b251a.jar` β†’ `RuntimeException: Cannot instantiate mods when not frozen!` (at `LabyModLoaderPlugin.initializeMixins`). The remapper hard-fails when its output jar already exists instead of skipping/overwriting. **Hypothesis:** Stale remap-cache entry (e.g. from an interrupted launch) bricks all mod loading. Idea #20949 about the remap cache was closed DONE on 06-04, yet this is from 06-10 β†’ incomplete fix or regression in LabyFabric 2.0.x. Likely user workaround: delete the `remapped/` folder. ### [HIGH-002] Launcher silently reinstalls uninstalled mods - **Category:** Launcher - **(Crash)logs:** https://paste.labymod.net/raw/ezitibuvanelevunakat - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1514001423069614173 - **Occurrences:** 1 - **OS:** Windows - **MC Version:** 1.21.x - **Affected user:** @Jake - **Status:** needs-info β€” Northernside requested launcher log + `%APPDATA%\LabyMod\instances.json` (06-09 22:37); user data still pending **User reports:** > "i uninstalled it 😭 […] oh now its there again when i relaunch the launcher" β€” @Jake, 2026-06-09 **Log analysis:** ezitibuvanelevunakat shows Axiom still loading after a UI-successful uninstall. Suspect: the 3.0.6 auto-refreshing content sync re-applying a cached manifest. This bug also actively sabotages debugging of mod conflicts (see the Axiom black-screen entry under Apparently Fixed β€” the user couldn't actually get rid of the suspect mod). ### [HIGH-003] Launcher fails to start silently β€” Electron globalShortcut race - **Category:** Launcher - **(Crash)logs:** none uploaded β€” crash text quoted in Discord (from `labymodlauncher-crash.log`) - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513177135341371412 Β· https://discord.com/channels/260471731809026048/260478719695519746/1514067753189904435 - **Occurrences:** 3 - **OS:** Windows - **MC Version:** n/a - **Affected users:** @The Rebirthed, @π“œπ“ͺ𝓾𝓿𝓲, @Zeesh - **Status:** open β€” recurring on 3.0.8 (Zeesh, 06-10); Northernside requested `labymodlauncher-install.log` + `-error.log` **User reports:** > "Seit heute lΓ€sst sich Laby nicht mal mehr starten. […] Selbst im Taskmanager wird nicht mal kurzzeitig irgendwas angezeigt" β€” @The Rebirthed, 2026-06-07 > "was working yesterday idk whats happening β€” doesnt even appear in task manager" β€” @Zeesh, 2026-06-10 **Log analysis:** ``` [2026-06-07T13:57:55.237Z] Unhandled Rejection: Error: globalShortcut cannot be used before the app is ready at eval (webpack-internal:///55391:678:31) ``` **Hypothesis:** Electron main-process startup race β€” `globalShortcut` registered before `app.ready` kills the process before any window exists, matching "not even in task manager". Reinstall "fixes" it (π“œπ“ͺ𝓾𝓿𝓲), consistent with a race/corrupt state. Three independent users in 72h, latest on 3.0.8. ### [HIGH-004] Iris shaders crash instantly on MC 26.1.x - **Category:** Client - **Component:** Rendering - **(Crash)logs:** https://paste.labymod.net/raw/isuvaxodonenezaqagub Β· https://paste.labymod.net/raw/daquyesoyutumiguwaqa Β· https://paste.labymod.net/raw/pabujigujosudarisidu - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513197676425117766 Β· https://discord.com/channels/260471731809026048/260478719695519746/1513531958284783677 - **Occurrences:** 2 - **OS:** Windows (AMD RX 7600, Adrenalin 26.6.1) - **MC Version:** 26.1.1 / 26.1.2 - **Affected users:** @Fr1day, @π“žπ“½π“ͺ𝓴𝓾 - **Linked Ideas:** [#20953 β€” My game crashes whenever I turn on a shader (Iris) [DUPLICATE]](https://laby.net/ideas/20953) (duplicate of an open Iris report) - **Status:** open β€” a snapshot fix attempt on 06-08 did **not** resolve it ("Crasht immer noch"); logs forwarded to devs **User reports:** > "Das Spiel crasht sofort, sobald ich ingame einen Shader aktiviere. Ohne Shader (nur Sodium) lΓ€uft alles stabil. […] Sieht fΓΌr mich nach einer InkompatibilitΓ€t von Iris mit MC 26.1 (evtl. in Kombi mit LabyMods Render-Hooks) aus." β€” @Fr1day, 2026-06-07 (tested Iris 1.10.8/1.10.9 Γ— Sodium 0.8.7/0.8.9, several shaderpacks, drivers current, render addons disabled β€” identical crash) **Log analysis:** `NullPointerException: Cannot invoke "org.joml.Matrix4fc.properties()" because "left" is null` inside `GameRenderer.wrapOperation$…$iris$renderLevel` β€” a null projection/modelview matrix handed into Iris' wrapped renderLevel, pointing at LabyMod's MC-26.1 render pipeline hooks. Exceptionally thorough user repro β€” this report deserves dev attention. --- ## 🟑 Medium ### [MED-001] OptiFine addon installs but never applies - **Category:** Client - **Component:** Mod-Compat - **(Crash)logs:** https://paste.labymod.net/raw/vodiyeqemobifixehequ Β· https://paste.labymod.net/raw/axeloboficusitofenos - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513166633584033812 Β· https://discord.com/channels/260471731809026048/260478719695519746/1513286289233809589 - **Occurrences:** 3 - **OS:** Windows - **MC Version:** 1.8.9 – 1.21.x - **Affected users:** @Raywastaken, @πŸŽ“Ω’Ω¦, @zach - **Linked Ideas:** [#20984 β€” Optifine installation doesnt work [PENDING_USER_ACTION]](https://laby.net/ideas/20984) - **Status:** open β€” staff (NULLYUKI) reproduced it: "I tested it on my end myself β€” it's a bug" > "even when i enable it in addons […] when i put it manually in mods folder, it doesnt launch" β€” @Raywastaken, 2026-06-07 **Log analysis:** OptiFine addon present in the addon list, but no OptiFine initialization follows β€” silent non-activation, no crash. Idea #20984 is PENDING_USER_ACTION; the Discord repro (3 users + staff) may be exactly what QA is waiting for. Related: @KeTaMiTeK found the installed OptiFine addon also prevents Fabric mods from being detected (historic LabyFabric behavior). ### [MED-002] VoiceChat: no audio in/out on LabyMod 4 (works on LM3) - **Category:** Client | **Component:** Mod-Compat - **(Crash)logs:** none provided - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513168974504923176 - **Occurrences:** 1 | **OS:** unknown | **MC Version:** unknown - **Affected user:** @ali - **Status:** needs-info β€” no staff response in window > "i cant hear or talk in voicechat […] tried deleting vc then downloading it again didn't fix it β€” if i use laby3 it works normally but it doesnt in laby4" β€” @ali, 2026-06-07 Same machine works on LM3 β†’ LM4 VoiceChat addon or its native audio backend, not user hardware. ### [MED-003] Random freeze β†’ crash with autogen LSS accessor ClassNotFoundException (1.8.9) - **Category:** Client | **Component:** Rendering - **(Crash)logs:** https://paste.labymod.net/raw/tepobapixudurabaqegu - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513600422622007376 - **Occurrences:** 1 | **OS:** Windows | **MC Version:** 1.8.9 - **Affected user:** @RomaNN - **Status:** open **Log analysis:** repeated fatal `ClassNotFoundException: net.labymod.autogen.core.lss.CoreCustomcrosshair_addonDirectPropertyValueAccessorRegisterBulk` (+ Keystrokes/Customnametags variants) at `Minecraft.checkGLError` β€” runtime-generated LSS property accessors fail to resolve. Additionally a cosmetic blows the bone limit (`Bone subtree 'glow_susanoo' has 302 bones, exceeds the maximum limit of 240`), spamming IllegalStateExceptions β€” possible freeze contributor. User says others on his server see the same. ### [MED-004] LabyMod updater corrupts MultiMC instances on close - **Category:** Other - **(Crash)logs:** none provided - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513276057753616615 - **Occurrences:** 1 | **OS:** unknown | **MC Version:** unknown - **Affected user:** @AmpersandHD - **Status:** open β€” asked twice, **no staff response in window** > "Seit circa einer Woche zerstΓΆrt mir der LabyMod Updater die Instanz beim Schließen […] Spiele ich sie aus einer Sicherung wieder ein, dann geht es genau einmal, danach wieder Crash Exit. Kann ich den LabyMod Updater irgendwie abklemmen?" β€” @AmpersandHD, 2026-06-07 Reproducible for ~a week; restore-from-backup works exactly once. Likely the LM4 self-updater writing a layout MultiMC doesn't expect. Third-party-launcher users are silently losing instances β€” worth a follow-up. ### [MED-005] hand_transformer: disabling the addon doesn't disable its effects - **Category:** Client | **Component:** Mod-Compat - **(Crash)logs:** n/a (behavioral) - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513939061247836294 - **Occurrences:** 1 | **OS:** Linux | **MC Version:** 1.8.9 module - **Affected user:** @Netherite0815 - **Status:** open β€” staff-confirmed known issue > "diese alte Schlag Animation ist an obwohl ich die nicht an habe und Range/Slowdown werden auf Servern nicht mehr blockiert" β€” @Netherite0815, 2026-06-09 Notable staff quote (NULLYUKI): *"Ich persΓΆnlich vertraue den Enable/Disable Settings nicht bei Addons/Allgemein"* β€” if QA doesn't trust addon toggles, this is a systemic addon-lifecycle bug, not just hand_transformer. ### [MED-006] LabyChat session/login failures β€” expired session needs manual re-login - **Category:** Client | **Component:** Auth - **(Crash)logs:** https://paste.labymod.net/raw/osexobedovikocakenil - **Message Links:** https://discord.com/channels/260471731809026048/260471731809026048/1513631199602675924 Β· https://discord.com/channels/260471731809026048/260478719695519746/1513848626697470084 - **Occurrences:** 2 | **OS:** Windows | **MC Version:** 1.21.10 / 4.5.5 - **Affected users:** @Tqjii, @JustinXII - **Status:** workaround β€” re-add account (Tqjii) / launcher logout+login (JustinXII) > "It's still expired lmao […] adding new account with same informations helped" β€” @Tqjii, 2026-06-09 Client doesn't refresh an expired token by itself. Note: RappyTV mentioned LabyChat **server-side** issues on 06-10 β€” some reports may be noise, but the stale-session pattern predates that. ### [MED-007] Stale imgui-java64.dll in %temp% breaks launcher start - **Category:** Launcher - **(Crash)logs:** https://paste.labymod.net/raw/ivijuliyusozoyaqejaf - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513195525535436830 - **Occurrences:** 1 | **OS:** Windows | **MC Version:** n/a - **Affected user:** @Vanessa3209 - **Status:** workaround β€” delete `%temp%\imgui-java-natives\1.0.2\imgui-java64.dll` Staff had a canned 4-step workaround ready β†’ known recurring issue. The launcher should hash-check/overwrite its extracted natives. (3.0.7's "natives extracted per instance" fix covers *game* natives, not the launcher's own imgui natives.) ### [MED-008] Clean MC 26.1.2 instance takes ~1 min to launch (Datafixer stall) - **Category:** Launcher - **(Crash)logs:** none provided - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513932541277503490 - **Occurrences:** 1 | **OS:** unknown | **MC Version:** 26.1.2 - **Affected user:** @moritz - **Status:** open β€” no staff response in window > "auf jeden fall deutlich lΓ€nger als bei modrinth, mc launcher etc" β€” @moritz, 2026-06-09 Stalls after `291 Datafixer optimizations took 318 milliseconds`; same machine is much faster on Modrinth/vanilla β†’ launcher-side overhead (remap? verification? content sync?) rather than vanilla cost. --- ## 🟒 Low ### [LOW-001] AUR labymodlauncher-bin: residual failures after PKGBUILD fix - **Category:** Launcher - **(Crash)logs:** attachments/1513924872479314111_message.txt Β· attachments/1513925417189380207_message.txt (file list + SIGSEGV run log, saved locally) - **Message Links:** https://discord.com/channels/260471731809026048/1043263187094605936/1513924522548527145 - **Occurrences:** 1 (residual; the main CI break is fixed β€” see Apparently Fixed) - **OS:** Arch Linux | **MC Version:** n/a - **Affected user:** @Kawwabi - **Status:** open β€” fix worked for @Niika/@D1manGamer but **not** for Kawwabi (06-10: "didn't work") Permission denied without sudo; pacman warns `directory permissions differ … filesystem: 700, package 755` on many files; `sudo --no-sandbox` run SIGSEGVs. Package ships files with modes unusable for non-root. Also: @D1manGamer notes the `.desktop` file lacks a description and sits in "Utility". ### [LOW-002] Blindness effect not rendering on 1.21.11 - **Category:** Client | **Component:** Rendering - **(Crash)logs:** attachments/1513226165832122368_image.png (screenshot) - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513226165832122368 - **Occurrences:** 1 | **OS:** unknown | **MC Version:** 1.21.11 - **Affected user:** @Phoenix - **Status:** open β€” no staff response in window > "its daytime in this screenshot β€” i don't have a fullbright addon" β€” @Phoenix, 2026-06-07 ### [LOW-003] LabyMod badge missing in tab list for some users (OPSucht) - **Category:** Client - **(Crash)logs:** none provided - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513636501827620864 Β· https://discord.com/channels/260471731809026048/260478719695519746/1514232986948735077 - **Occurrences:** 1 user, persisting 3+ days | **OS:** unknown | **MC Version:** unknown - **Affected user:** @Geldi - **Status:** needs-info β€” snapshot fix on 06-08 didn't help; RappyTV attributes it to current LabyMod server-side issues (06-10) ### [LOW-004] Carpet Mod no longer compatible - **Category:** Client | **Component:** Mod-Compat - **(Crash)logs:** none provided - **Message Links:** https://discord.com/channels/260471731809026048/260478719695519746/1513947444373884950 - **Occurrences:** 1 | **Affected user:** @Bluemchen - **Status:** needs-info β€” unanswered; needs a log (if mixin APPLY error β†’ belongs to the fixed June-8 wave, otherwise new) ### [LOW-005] Launcher doesn't remember window position (multi-monitor) - **Category:** Launcher - **Message Links:** https://discord.com/channels/260471731809026048/1043263187094605936/1513927745875345572 - **Occurrences:** 1 | **OS:** Arch Linux - **Affected user:** @Niika - **Linked Ideas:** [#20999 β€” Starting window resolution doesnt apply [OPEN]](https://laby.net/ideas/20999) (related window-geometry issue, also still open) - **Status:** open --- ## βœ… Apparently Fixed Issues observed in the period that releases appear to address. Verify before closing. - **LabyFabric 2.0.x mixin APPLY failures β€” the June-8 mass crash wave** (FerriteCore `BlockStateCacheMixin`, `fabric-lifecycle-events-v1` `method_29741`, fabric-resource-loader, …): ONE root cause β€” mixin target resolution against intermediary names broke in 2.0.9; every mixin-using mod failed during APPLY. **13+ users in ~3h** (@zuna, @Glqch, @Dark_Mandalor, @Savi, @Kazupolis, @klopeq, @Pizzamaxpizza, @Tharson_, @fluchtfahrzeug, @darki x3, @Telve, @FizzyBubbele00, @khalid7445, …). Fixed in **LabyFabric 2.0.10** (06-08, "Fixed an issue where some mods could not be loaded"); rollout delayed ~30 min by Cloudflare caching the old jar. **Confirmed** by multiple users; @Dark_Mandalor: *"Habt uns allen den Hintern gerettet."* Ideas: [#20912 DONE](https://laby.net/ideas/20912), [#20987 DONE](https://laby.net/ideas/20987), [#20988 DUPLICATE](https://laby.net/ideas/20988). Logs: [zayocuselumatapulayi](https://paste.labymod.net/raw/zayocuselumatapulayi) Β· [hegiketoriqezopeguba](https://paste.labymod.net/raw/hegiketoriqezopeguba) Β· [owafuzigaxebagecuvaj](https://paste.labymod.net/raw/owafuzigaxebagecuvaj). ⚠️ Note: #20912 had already been marked fixed once **while users still crashed** β€” double-check fix claims against fresh logs before closing ideas. - **Xaero maps crash β€” missing `merged-mappings-1.21.11.jar`** (@SnowyyTV-187, @simonpro10, @Dark_Mandalor + "kenne viele die das gleiche Problem haben"): `NoSuchFileException` on the mappings jar under `instances\\game\labymod-neo\fabric\mappings` β€” wrong-directory family fixed in LabyFabric 2.0.6–2.0.10. **Confirmed** by @SnowyyTV-187 (06-08: "Ja es geht wieder"). Idea [#20994 PENDING_USER_ACTION](https://laby.net/ideas/20994) could be closed with this resolution. Log: [nukuzevadinunutacugu](https://paste.labymod.net/raw/nukuzevadinunutacugu). - **Borderless fullscreen NPE crash** (@King H-O, @_1z__): `NPE: BorderlessWindow.toggleFullscreen()` when launcher fullscreen + explicit window size are combined. Fixed in **Launcher 3.0.8** (exact changelog match); @King H-O acknowledged 06-10 and is verifying. Related idea [#20999 OPEN](https://laby.net/ideas/20999) (resolution not applied) is the same code path but NOT fixed. - **Launcher addon/mod install error** (@Kaktus): error dialog on every install attempt, also blocked game start. Staff: fixed in **3.0.8** ("crash when reading a corrupt or invalid addon/mod jar" likely match). Unconfirmed β€” user was asked to report back. Side-find: CTRL+Shift+L didn't open a launcher log for this user. - **Per-instance overlay hijacks schematics/configs** (@Kn0cki, @Tharson_, @RainerRainer75, @The Rebirthed/CommandKeys config, @khalid7445 β€” OPSucht community): Litematica schematics & mod configs read from `instances\\overlay\` instead of `.minecraft`. Fixed in **3.0.7/3.0.8** (default instance now runs directly in `.minecraft`, stale overlays cleaned up). **Confirmed** by @Kn0cki after rerun-migrations on 3.0.7. ⚠️ Caveat: @khalid7445 reports real data loss after manually moving files then re-running migrations β€” the migration overwrite path deserves a backup-before-overwrite safety check. - **Windows firewall prompt on every launch** (@The Rebirthed, @Gamerboy, @Timo): fixed in **3.0.7** ("communication server binding to the wrong interface"). No new reports after 06-07. Log: [tagadewuwokodewiqava](https://paste.labymod.net/raw/tagadewuwokodewiqava). - **Axiom (+ Fabric API) black screen on launch** (@Jake): **LabyFabric 2.0.12** (06-10, "Fixed an issue where some mods were causing a black screen") matches symptom and timing. Unconfirmed. Logs: [runexipatobayozozohe](https://paste.labymod.net/raw/runexipatobayozozohe) Β· [ezitibuvanelevunakat](https://paste.labymod.net/raw/ezitibuvanelevunakat). Diagnosis was hampered by HIGH-002 (uninstalled Axiom kept coming back). - **Standalone Forge 1.20.1 instance crash from launcher** (@ESK): cause identified by staff same night, fixed in **3.0.7** (Forge manifest deduplication / duplicate libraries). Unconfirmed. Log: [vuboyuzugebilevuleju](https://paste.labymod.net/raw/vuboyuzugebilevuleju). - **Chat logs not written to `.minecraft/logs` since ~June 3** (@lottie, @moorrisss, @starwarsfreak219, @Nik Tan): temp launcher fix in **3.0.7**, proper client fix in snapshot with production rollout announced for 06-09. Idea [#20956 still ACCEPTED](https://laby.net/ideas/20956) β€” verify the client fix actually shipped before closing. --- *Excluded as external/not bugs: Mojang auth 503 outage (06-08, ~10 min, api.minecraftservices.com), ISP-level "can't join servers without VPN" (@Jake β€” resolved by network reset; @LKZ β€” server VPN protection working as intended), resource-packs-in-subfolders (feature request, [idea #18814](https://laby.net/ideas/18814)), VPN false-ban complaints (ticket/moderation domain), cosmetic shop/pricing discussions.*