MCreator runClient crash + workspace issues (need help)

I’m using MCreator 2026.1 (Windows 11, Java 21, NeoForge 1.21.8). My main issue is that the dev client consistently crashes and the workspace has had instability.

1. Main crash (runClient)

When running Run Client, it fails immediately with:

• EXCEPTION_ACCESS_VIOLATION
• atio6axx.dll (AMD graphics driver)

Crash happens during:
ImmediateWindowProvider (fmlearlywindow)

Vanilla Minecraft runs fine, so the issue is specific to the MCreator dev environment.

2. Behaviour of crash

• Happens immediately on startup
• Occurs before Minecraft fully loads
• Consistent across multiple runs
• Points to native OpenGL/driver failure rather than mod code

3. Environment details

• MCreator 2026.1
• Windows 11
• Java 21 (JetBrains runtime bundled with MCreator)
• AMD GPU (OpenGL driver involved in crash)

4. What I’ve tried

• Restarting MCreator and PC
• Switching/adjusting Java (Temurin 21 attempted previously)
• Deleting Gradle and MCreator caches
• Killing stuck Java/MCreator processes
• Workspace rebuilds and syncs

5. Result

• Vanilla Minecraft works normally
• MCreator workspace sometimes loads but runClient always crashes
• Crash always points to AMD driver (atio6axx.dll)

What I need help with

• Fixing EXCEPTION_ACCESS_VIOLATION (atio6axx.dll) during MCreator runClient
• Stability for NeoForge dev environment on AMD GPUs