I have a strange behaviour on Windows. I have tested this on a VM with Windows 11 ARM, and a PC with Windows 10 (x86 64bit). My requirements.txt: requests==2.32.3 chardet==5.2.0 python-dateutil pyweatherbit feedparser unidecode urllib3 sdnotify rich freetype-py PyJWT cryptography roonapi spotipy pillow pyweatherbit certifi websockets==13.1 platformdirs - started app in VScode (Runa and Debug) it works, serious-python has loaded all packages and the Python script is running fine. - started with 'fvm flutter run --release' it works too. - build with 'fvm flutter build windows' is well done without errors, The exe is running, **but the Python part is NOT running**. I've got an **error in the ntdll.dll,** Version: 10.0.26100.8457 module name: ntdll.dll, Version: 10.0.26100.8457, timestamp: 0xac224bdc Error code: 0xc0000005 Error offset: 0x0000000000193118 process ID:: 0xE44 application path: C:\Users\swilhelm\dev\gits\roonmatrix\build\windows\x64\runner\Release\roonmatrix.exe module path: C:\WINDOWS\SYSTEM32\ntdll.dll report ID: ae260409-ecd4-4c49-8149-bbdaa435f64f Signature: P1: roonmatrix.exe P2: 1.2.3.91 P3: 6a0fffb5 P4: ntdll.dll P5: 10.0.26100.8457 P6: ac224bdc P7: c0000005 P8: 0000000000193118 P9: P10: The error is exactly the same on VM with Win11 and PC with Win10. The same app on Ubuntu and macOS is running fine. Do you have any idea what's going on there? Do you need more information?