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I'm storyboarding a project with about 40 clips. The project is currently about 1000 frames and set to 3 fps. When I hit play in the project view, sometimes frames show up of drawings that are not present in that frame, they're not even from the clip. Why is this happening? When I scrub the timeline of the entire project, the drawings show up just fine. Is it a cache thing maybe? Can I purge the cache somewhere? Or disable it altogether? It always seems to be happening at the same frames.

Not sure if this is a known issue and if the info provided is enough to help, but thanks in advance

I have encountered this problem in the past and have reported it. However, since the cause could not be identified, the problem could not be resolved.

https://forum.tvpaint.com/viewtopic.php?t=13873

(13-1)While playing a project (multiple clips), video of another clip is inserted
→The cause could not be determined

We've had this happen a few times, but we have never managed to do it intentionally, so we haven't been able to fix it.

I've noticed this behaviour a few times in TVP and Photoshop on this old Mac of mine, and I believe it's a matter of faulty video buffer. Since it's only there for the glimpse of a second I don't care.

I hope the bug can be found and fixed at some point.

Currently fixed my situation by disabling some settings in:
Windows > Animation > Preview Settings (Seems to me these settings are better of as a tab in TVPaint Preferences, they are currently a bit hidden away in a place you really don't expect them)

And the problem goes away. My guess is that proxy render had old frames that are not being marked as dirty when they should be. So they aren't being rendered with the new pixels, because TVP assumes the frames are fine. Maybe?