Windows/AMD/Flux compatibility

Help Needed

Hello,

Has anyone been able to get a flux checkpoint to work on a Windows system with an AMD GPU? I can get most of the other checkpoints to work normally, but I ComfyUI crashes every time I try to use any flux checkpoint. I've tried both the Windows installer and the Windows portable versions with no luck. Looking at the logs, I get the following sequence of entries along with the application crash. I'd love any help I can get with solving this. Thanks in advance!

got prompt
Exception Code: 0xC0000005
0x00007FF84DBB3061, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_cpu.dll(0x00007FF84D2E0000) + 0x8D3061 byte(s), ?_local_scalar_dense_cpu@native@at@@YA?AVScalar@c10@@AEBVTensor@2@@Z() + 0xF1 byte(s)
0x00007FF84E8425A2, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_cpu.dll(0x00007FF84D2E0000) + 0x15625A2 byte(s), ?call@_local_scalar_dense@_ops@at@@SA?AVScalar@c10@@AEBVTensor@3@@Z() + 0xD2 byte(s)
0x00007FF84DBB2A65, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_cpu.dll(0x00007FF84D2E0000) + 0x8D2A65 byte(s), ?item@native@at@@YA?AVScalar@c10@@AEBVTensor@2@@Z() + 0x155 byte(s)
0x00007FF84E5493B2, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_cpu.dll(0x00007FF84D2E0000) + 0x12693B2 byte(s), ?call@item@_ops@at@@SA?AVScalar@c10@@AEBVTensor@3@@Z() + 0xD2 byte(s)
0x00007FF84F8DFBC3, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_cpu.dll(0x00007FF84D2E0000) + 0x25FFBC3 byte(s), ??$item@E@Tensor@at@@QEBAEXZ() + 0x23 byte(s)
0x00007FF89A3A7A23, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_python.dll(0x00007FF8997F0000) + 0xBB7A23 byte(s), ??4?$THPPointer@UTHPGenerator@@@@QEAAAEAV0@$$QEAV0@@Z() + 0x633 byte(s)
0x00007FF899D6191A, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_python.dll(0x00007FF8997F0000) + 0x57191A byte(s), ?THPStorage_assertNotNull@@YAXPEAU_object@@@Z() + 0x13BA byte(s)
0x00007FF91B739676, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xD9676 byte(s), PyUnicode_FromFormatV() + 0x1A6 byte(s)
0x00007FF91B737E54, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xD7E54 byte(s), PyNumber_Float() + 0x5F8 byte(s)
0x00007FF91B7127A6, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB27A6 byte(s), PyObject_Call() + 0xB6 byte(s)
0x00007FF91B6E66EE, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x866EE byte(s), _PyEval_EvalFrameDefault() + 0x40DE byte(s)
0x00007FF91B6E103C, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x8103C byte(s), _PyFunction_Vectorcall() + 0x17C byte(s)
0x00007FF91B710A42, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB0A42 byte(s), PyTuple_Pack() + 0x1FA byte(s)
0x00007FF91B6CBA67, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x6BA67 byte(s), PySequence_GetItem() + 0x47 byte(s)
0x00007FF89A417BF3, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_python.dll(0x00007FF8997F0000) + 0xC27BF3 byte(s), ?legacy_tensor_ctor@utils@torch@@YA?AVTensor@at@@W4DispatchKey@c10@@W4ScalarType@6@PEAU_object@@2@Z() + 0xFE3 byte(s)
0x00007FF89A41DC2D, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_python.dll(0x00007FF8997F0000) + 0xC2DC2D byte(s), ?legacy_tensor_ctor@utils@torch@@YA?AVTensor@at@@W4DispatchKey@c10@@W4ScalarType@6@PEAU_object@@2@Z() + 0x701D byte(s)
0x00007FF899E1BDF4, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\torch\lib\torch_python.dll(0x00007FF8997F0000) + 0x62BDF4 byte(s), ?THPCppFunction_Check@autograd@torch@@YA_NPEAU_object@@@Z() + 0x20BE4 byte(s)
0x00007FF91B6979E4, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x379E4 byte(s), PyThread_acquire_lock_timed() + 0x5F0 byte(s)
0x00007FF91B7127A6, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB27A6 byte(s), PyObject_Call() + 0xB6 byte(s)
0x00007FF95AD10EAB, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\safetensors\_safetensors_rust.pyd(0x00007FF95ACF0000) + 0x20EAB byte(s)
0x00007FF95AD0FBBA, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\safetensors\_safetensors_rust.pyd(0x00007FF95ACF0000) + 0x1FBBA byte(s)
0x00007FF95AD019B7, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\safetensors\_safetensors_rust.pyd(0x00007FF95ACF0000) + 0x119B7 byte(s)
0x00007FF95AD09C2F, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\safetensors\_safetensors_rust.pyd(0x00007FF95ACF0000) + 0x19C2F byte(s)
0x00007FF95AD0AFC8, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\safetensors\_safetensors_rust.pyd(0x00007FF95ACF0000) + 0x1AFC8 byte(s)
0x00007FF95ACFB752, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\Lib\site-packages\safetensors\_safetensors_rust.pyd(0x00007FF95ACF0000) + 0xB752 byte(s)
0x00007FF91B6C30E3, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x630E3 byte(s), PyErr_SetNone() + 0xDF byte(s)
0x00007FF91B6E1A5F, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x81A5F byte(s), PyObject_Vectorcall() + 0xCF byte(s)
0x00007FF91B6E19C5, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x819C5 byte(s), PyObject_Vectorcall() + 0x35 byte(s)
0x00007FF91B6E2EA5, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x82EA5 byte(s), _PyEval_EvalFrameDefault() + 0x895 byte(s)
0x00007FF91B6E103C, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x8103C byte(s), _PyFunction_Vectorcall() + 0x17C byte(s)
0x00007FF91B6DBE18, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x7BE18 byte(s), _PyArg_CheckPositional() + 0x45C byte(s)
0x00007FF91B71286B, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB286B byte(s), PyObject_Call() + 0x17B byte(s)
0x00007FF91B71275F, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB275F byte(s), PyObject_Call() + 0x6F byte(s)
0x00007FF91B6E66EE, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x866EE byte(s), _PyEval_EvalFrameDefault() + 0x40DE byte(s)
0x00007FF91B6AB201, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x4B201 byte(s), _PyGen_Finalize() + 0x389 byte(s)
0x00007FF91B8A4F58, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x244F58 byte(s), PyGen_NewWithQualName() + 0x2C byte(s)
0x00007FF91B89B57D, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x23B57D byte(s), PyIter_Send() + 0x35 byte(s)
0x00007FF9ABF97334, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\_asyncio.pyd(0x00007FF9ABF90000) + 0x7334 byte(s), PyInit__asyncio() + 0x5AE4 byte(s)
0x00007FF9ABF96C7E, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\_asyncio.pyd(0x00007FF9ABF90000) + 0x6C7E byte(s), PyInit__asyncio() + 0x542E byte(s)
0x00007FF91B6C560E, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x6560E byte(s), _PyObject_MakeTpCall() + 0xA2 byte(s)
0x00007FF91B8C96E0, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x2696E0 byte(s), _PyContext_NewHamtForTests() + 0x80 byte(s)
0x00007FF91B8C99C0, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x2699C0 byte(s), _PyContext_NewHamtForTests() + 0x360 byte(s)
0x00007FF91B6C8376, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x68376 byte(s), PySet_Add() + 0xAC2 byte(s)
0x00007FF91B712815, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB2815 byte(s), PyObject_Call() + 0x125 byte(s)
0x00007FF91B71275F, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB275F byte(s), PyObject_Call() + 0x6F byte(s)
0x00007FF91B6E66EE, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x866EE byte(s), _PyEval_EvalFrameDefault() + 0x40DE byte(s)
0x00007FF91B6E103C, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x8103C byte(s), _PyFunction_Vectorcall() + 0x17C byte(s)
0x00007FF91B6DBE6C, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x7BE6C byte(s), _PyArg_CheckPositional() + 0x4B0 byte(s)
0x00007FF91B712815, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB2815 byte(s), PyObject_Call() + 0x125 byte(s)
0x00007FF91B71275F, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0xB275F byte(s), PyObject_Call() + 0x6F byte(s)
0x00007FF91B68304C, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x2304C byte(s), PyInterpreterState_Delete() + 0x500 byte(s)
0x00007FF91B682FF2, C:\Users\chris\Documents\ComfyUI_windows_portable\python_embeded\python312.dll(0x00007FF91B660000) + 0x22FF2 byte(s), PyInterpreterState_Delete() + 0x4A6 byte(s)
0x00007FF9CD0637B0, C:\WINDOWS\System32\ucrtbase.dll(0x00007FF9CD060000) + 0x37B0 byte(s), wcsrchr() + 0x150 byte(s)
0x00007FF9CE9DE8D7, C:\WINDOWS\System32\KERNEL32.DLL(0x00007FF9CE9B0000) + 0x2E8D7 byte(s), BaseThreadInitThunk() + 0x17 byte(s)
0x00007FF9D01EC40C, C:\WINDOWS\SYSTEM32\ntdll.dll(0x00007FF9D0160000) + 0x8C40C byte(s), RtlUserThreadStart() + 0x2C byte(s)

C:\Users\chris\Documents\ComfyUI_windows_portable>pause
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Posted Feb 19, 2026, 9:58 PM UTC