Created attachment 111518 [details] screenshot of error message When running Kwin with MESA_DEBUG=1, I get the the following output when ALT+TABing through the window list: Mesa: User error: GL_INVALID_OPERATION in GlTexSubImage2D(invalid texture level 0)
Could be Qt as well. Which switcher theme are you using?
this happens with the "Breeze" switcher theme.
This issue report is quite old. Can you please confirm, that it still persists with KDE 5.23?
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!