Newest SVP build and nVidia GPU driver present avisynth and vaporsynth player problems.
I am using newest SVP 4.7.0.302 and 580.97 Studio driver. MPC-BE & MPC-HC crash opening any video file. If I turn off vaporsynth in players external filters, players open with audio but no video. If I also turn off avisynth, playback is fine rendering audio and video normally along with madVR, LAV, etc. Naturally, real-time SVP isn't possible.
If I uninstall and reinstall the previous Studio GPU driver, there are no problems except SVP now shows GPU acceleration isn't possible when I used to be able to select the RTX 5090 and Optical Flow.
If I use previous SVP build and previous GPU driver, there are no problems I'm aware of at all. Everything works as intended afaik. I'm surprised I've seen no other complaints of this. Then again, perhaps it's just on my end although I've no idea why or how since it's a fresh O/S install with my normal apps and adjustments as usual. Now I see I'm not alone. You've asked the same thing I prepared this text for earlier.
Back at the time I tested using 4.6.0.294 which was good and 4.6.0.296 which was not good. Uhg! 2hr time limit between posts.