I just updated 'WhisperWithVAD PRO'. It should be working correctly now. Please test it when you can.
The root cause was a compatibility issue between Whisper, Spleeter and Python numpy that was triggered by an upgrade in Colab. Making all these to work together would be quite fragile and continues to break. For now, the best-fit solution I came up with is to deactivate Spleeter. I.e. the option for "Source Separation" is no longer available. If anyone still needs that option please let me know.
I have saved the older version as back up in the same folder if someone wants to work on it.