FabFilter

This affects Pro-C 2 far more often than Pro-L 2, as frequently as several times a minute. Basically, the plug-ins change their scrolling rate apparently at random; here is an example screenshot: imgur.com/a/mlv1JLQ

If you look at the red gain reduction line, left and right halves are obviously not at the same rate - the image shows a kick-and-bassline loop at constant BPM.

Now is as good time as any to ask for Pro-C to get a choice of scrolling rates, like Pro-L 2 has :)

Forgot to add, this is in VST3, Reaper, Windows 11