I have a somewhat related issue with the Waves GUI - whenever I click and drag one of the controls in a Waves (V9) plugin, like Q4 or Renaissance EQ, and release the mouse button, the cursor jumps to a completely different point on the screen. This basically renders my Waves plugins unusable in Cubase 10.5, so for the moment I have to go back to using C10. It would be great if it would be possible to find a fix for this - if I had known about the SDK changes between 10 and 10.5 and the consequences, I would probably have stuck with C10.