Visual Glitch in Fusion with mask

I've just created a relatively simple mask wipe effect in DR(S) 17 beta 7 and noticed a glitch during playback in DR/Fusion (see attached)

visual artefact during playback

Screenshot_2021-01-27 23_34_02-Window.png (413.78 KiB) Viewed 791 times

Currently using NVIDIA Studio Driver 461.40 with an RTX 2080Ti

No idea if it is driver, DR, or anything else but wanted to document before I started more debugging

If anyone has any ideas / suggestions, I'm open to them

Jon

AMD 3950 / 64Gb / Win10

I don't know what it's supposed to look like, so...

I don't know what it's supposed to look like, so...

Scuba divers in the sea .... roughly 40 seconds into this Vimeo video

Screenshot_2021-01-28 22_28_28-Window.png (551.35 KiB) Viewed 727 times

Got it.

Now the node tree?

Got it.

Now the node tree?

I get the feeling we're playing 20 questions ... (so I'll try and answer a few potentials in advance)

Node tree

Screenshot_2021-01-29 23_25_17-Window.png (43.05 KiB) Viewed 677 times

The mask is a basic wipe with a bunch of keyframes moving a power window across from right to left .. nothing fancy ... it was supposed to be a quick, gimmicky video for a friend

FYI since I quit and restarted DR the weird "corruption" went away ...

Maybe the noise reduction (default settings) ... maybe something else .. I don't know (hence my asking here for input/guidance)

Screenshot_2021-01-29 23_28_31-Window.png (19.75 KiB) Viewed 677 times

What I don't have are debug logs while the corruption was in place .. and as I say, restarting seems to have solved it ... this time

I'm also seeing clips randomly going "offline" (multiple projects, all GoPro footage) when I leave DR idle for a while (1h+), even though they're visible when I mouse over ... again, they show as available if I restart DR (they seem to be h.265 the last time I saw this, not sure if they're always h.265 or sometimes also h.264)

This is all on Studio 17.0 beta 7 on Windows