weird performance quirk in 16.2

getting very poor playback result (lots of dropped frames). I discovered by pure chance that if I put a disabled track (or solid color) on top of the active clips then it works fine...see below. So until further notice I have added a 'top' track with a disabled solid color and performance is once again smooth. Hope you guys can work out whats causing this weird effect...

Annotation 2020-03-30 140215.png (111.77 KiB) Viewed 653 times

You're using Build 55?

You should also update your signature to show the correct version that you are using.

Yes, using build 55. If dummy track is disabled using the selector icon (middle icon) then the fix doesn't work i.e playback is very jerky. If the dummy track is enabled with the icon but disabled (D) the playback is smooth and as normal.

Should be quite simple to recreate and fix

Well, you're the only person I've seen report this so far. I also haven't seen this on either oy my two systems.

So it may not be that easy to recreate.