Laptop: Intel HD Grapics 620, i5-7200U, 16GB RAM , X-Server X Org 11.0, Realease 1.20.9
Same issues on a Desktop with same SW, but with Radeon RX 570, Ryzen 7 3700X, 32GB RAM
Any further info needed?
In addition I experienced there are two windows: the regular window with the Theater view and a second white one as an overlay. With some tricks of the mouse I can make the theater view window visible and then everything is working normal. But as I'm usually in touch mode, there is no mouse :-(