BiRefNet node stuck at 0% with no error on Mac Apple Silicon (ComfyUI Desktop)

[monasu919-code]

Environment

• Mac mini (Apple Silicon)
• macOS (darwin)
• ComfyUI Desktop v0.8.28
• Python 3.12.11
• PyTorch 2.11.0
• ComfyUI-RMBG v3.0.0
• transformers 4.48.3

Bug Description
BiRefNet node gets stuck at 0% with no error message and no progress. The queue shows "BiRefNetRMBG: 0%" indefinitely.

Steps to Reproduce

1. Use the BiRefNet (RMBG) node with either BiRefNet-general or BiRefNet-portrait model
2. Connect a LoadImage node and run the workflow
3. The node gets stuck at 0% — no error, no output

Additional Notes

• RMBG-2.0 works fine on the same machine
• BEN2 and INSPYRENET have not been tested
• The console log shows: Using BiRefNet-general model with 1024 resolution and then hangs with no further output
• Tried downgrading transformers from 5.5.3 to 4.48.3 — issue persists
• Suspect this may be related to Apple Silicon MPS backend incompatibility

Is this a known issue on Mac / Apple Silicon? Any workaround would be appreciated.

[sbgraphic]

I get these errors when lauching ComfyUI (Stability Matrix portabe, mac os tahoe latest),
no idea if is related or not ?

Error loading /Applications/Data/Packages/ComfyUI/custom_nodes/ComfyUI-RMBG/py/AILab_SegmentV2.py: No module named 'groundingdino' Error loading /Applications/Data/Packages/ComfyUI/custom_nodes/ComfyUI-RMBG/py/AILab_SAM3Segment.py: No module named 'triton' Warning: GroundingDINO not available. Text prompts will use fallback method. Error loading /Applications/Data/Packages/ComfyUI/custom_nodes/ComfyUI-RMBG/py/AILab_SegmentV2.py: No module named 'groundingdino' Error loading /Applications/Data/Packages/ComfyUI/custom_nodes/ComfyUI-RMBG/py/AILab_SAM3Segment.py: No module named 'triton' Warning: GroundingDINO not available. Text prompts will use fallback method. [ComfyUI-RMBG] v3.0.0 | 41 nodes Loaded

tried to reinstall manually in venv but… i get this error too

Requirement already satisfied: opencv-python>=4.7.0 in /Applications/Data/Packages/ComfyUI/venv/lib/python3.12/site-packages (from -r requirements.txt (line 6)) (4.13.0.92) Requirement already satisfied: onnxruntime>=1.15.0 in /Applications/Data/Packages/ComfyUI/venv/lib/python3.12/site-packages (from -r requirements.txt (line 7)) (1.24.4) ERROR: Could not find a version that satisfies the requirement onnxruntime-gpu>=1.15.0 (from versions: none) ERROR: No matching distribution found for onnxruntime-gpu>=1.15.0 ((venv) ) ∑