@mia @zleap Ok the bug is: sometimes when right clicking on items in the system tray, the menu takes long to open, then it feels like the whole plasmashell freezes, and some time later hundreds of context menus appear on top of one another, so you get this thick black steadily growing and darkening shadow, everything else becomes unresponsive. The only way out is to kill plasmashell (i didn't find how to restart it afterwards) or reboot from another TTY