I am able to reproduce both issues on RV515, by installing kwin and running "kwin --replace", then right click on the window frame to "Configure Window Behaviour" and "Enable Desktop Effects". Just moving windows around and switching between them with Alt-Tab does trigger the issues.
I am able to reproduce both issues on RV515, by installing kwin and running "kwin --replace", then right click on the window frame to "Configure Window Behaviour" and "Enable Desktop Effects". Just moving windows around and switching between them with Alt-Tab does trigger the issues.