Comfy UI will not start on V. 0.9.1; getting windows access violation error. AMD GPU

Desktop Feedback Windows
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1

Unable to start comfy ui on version 0.9.1. Troubleshooting only tells me to reinstall; which I have done, multiple times.

I am running on an AMD GPU, an RX 6700 10gb, have downloaded the ROCm drivers and such and all other dependencies. Pasting log below.

2026-05-14 16:55:58.455] [info] Adding extra search path custom_nodes C:\Users\willi\Documents\ComfyUI\custom_nodes
Adding extra search path download_model_base C:\Users\willi\Documents\ComfyUI\models
Adding extra search path custom_nodes C:\Users\willi\AppData\Local\Programs\ComfyUI\resources\ComfyUI\custom_nodes

[2026-05-14 16:55:58.457] [info] Setting output directory to: C:\Users\willi\Documents\ComfyUI\output
Setting input directory to: C:\Users\willi\Documents\ComfyUI\input
Setting user directory to: C:\Users\willi\Documents\ComfyUI\user

[2026-05-14 16:55:59.446] [info] [START] Security scan
[DONE] Security scan
** ComfyUI startup time: 2026-05-14 16:55:59.439

[2026-05-14 16:55:59.447] [info] ** Platform: Windows
** Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
** Python executable: C:\Users\willi\Documents\ComfyUI.venv\Scripts\python.exe
** ComfyUI Path: C:\Users\willi\AppData\Local\Programs\ComfyUI\resources\ComfyUI
** ComfyUI Base Folder Path: C:\Users\willi\AppData\Local\Programs\ComfyUI\resources\ComfyUI
** User directory: C:\Users\willi\Documents\ComfyUI\user
** ComfyUI-Manager config path: C:\Users\willi\Documents\ComfyUI\user__manager\config.ini
** Log path: C:\Users\willi\Documents\ComfyUI\user\comfyui.log

[2026-05-14 16:56:00.183] [info] [ComfyUI-Manager] Skipped fixing the ‘comfyui-frontend-package’ dependency because the ComfyUI is outdated.

[2026-05-14 16:56:00.184] [info] [PRE] ComfyUI-Manager

[2026-05-14 16:56:01.522] [error] Windows fatal exception: access violation

Stack (most recent call first):
File “C:\Users\willi\Documents\ComfyUI.venv\Lib\site-packages\torch\cuda_init_.py”, line 182 in is_available
File “C:\Users\willi\Documents\ComfyUI.venv\Lib\site-packages\comfy_kitchen\backends\cuda_init_.py”, line 639 in register
File "C:\Users\willi\Documents\ComfyUI.venv\Lib\site-packages\comfy_kitchen\backends\cuda_init.py", line 650 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “”, line 488 in _call_with_frames_removed
File “”, line 1415 in
[2026-05-14 16:56:01.523] [error] handle_fromlist
File "C:\Users\willi\Documents\ComfyUI.venv\Lib\site-packages\comfy_kitchen_init.py", line 3 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “C:\Users\willi\AppData\Local\Programs\ComfyUI\resources\ComfyUI\comfy\quant_ops.py”, line 7 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “C:\Users\willi\AppData\Local\Programs\ComfyUI\resources\ComfyUI\comfy\memory_management.py”, line 8 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “C:\Users\willi\AppData\Local\Programs\ComfyUI\resources\ComfyUI\comfy\utils.py”, line 25 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “C:\Users\willi\AppData\Local\Programs\ComfyUI\resources\ComfyUI\main.py”, line 204 in

2

Sam here… this is the only error before python exits. This file does not exist.

[error] Log rotation: cannot access log dir C:\Users\vaibh\AppData\Roaming\ComfyUI\logs\comfyui.log

[2026-05-15 18:28:09.712] [error] Python process exited with code 3221225781 and signal null

[2026-05-15 18:28:09.728] [error] Unhandled exception during server start Error: Python process exited with code 3221225781 and signal null

3

NVM, just cloned the repo and running it manually, work just fine

4

I had the same issue but with the GUI update. I get this message. But the troubleshoot says everything is fine. Then I try to run it and get the error.

5

I have the same problem. Comfy totally started working after latest update. Trouble shoot gives not errors but also says that errors remain.

Logs seem fine except for this, though I understand zero of the logs

[2026-05-20 20:50:16.602] [error] Python process exited with code 2 and signal null
[2026-05-20 20:50:16.606] [error] Unhandled exception during server start Error: Python process exited with code 2 and signal null
at ChildProcess. (H:\ComfyUI\resources\app.asar.vite\build\main.cjs:38845:18)
at ChildProcess.emit (node:events:519:28)
at ChildProcess._handle.onexit (node:internal/child_process:294:12)

6

Didn’t expect to be troubleshooting the app for hours today. Same thing happened here. Will turn off automatic updates from now on.