A few things that people have had issues with that I can come up with on top of my head:
- Some have had issues with mpv v2 and solved it by replacing it with mpv v1.
- Graphics card OpenGL version compatibility issues (support for at least v3.3 is required iirc).
- AVX vs non-AVX version of OFS (depends on your CPU).
- ffmpeg download issues. Some downloaded it manually to solve issues.
- Some have solved their issues by running OFS as administrator.
- Some deleted the C:\Users\yourwindowsusername\AppData\Roaming\OFS\OFS3_data folder to get rid of corrupted settings.
- Check the OFS log file for clues.