[HELP] Vapoursynth stopped working after Upgrade

[Tom]

Hi Selur,

thanks for getting back to me.

a) I have also tested the latest version as well, but I am seeing exactly the same problem.
b) The VapourSynth preview works correctly, but the processed/output video is identical to the input, as if no filtering was applied.
c) The issue occurs with different source formats, including ProRes and MPEG, so it does not seem to be tied to a specific codec or container.
d) I do not have any third-party antivirus or security software installed; I am only using the built-in Windows Defender.

I have one additional question: could there be issues caused by other Python installations that I had installed in the past but have since removed? I am wondering whether leftover files or environment variables could interfere with VapourSynth.

Also, do I need specific Microsoft Visual C++ Redistributables installed for Hybrid, or would you recommend uninstalling existing C++ redistributables and reinstalling only the required ones?

Thanks again for your help.

Best regards,
Thomas