In the IDE, I get QXcbConnection: XCB error: 3 (BadWindow), sequence: 757, resource id: 52444602, major code: 40 (TranslateCoords), minor code: 0 What's happening here? :) I just saw my laptop crashing, i. e. the GUI didn't react anymore, then the machine ran into shutdown itself. Maybe it had nothing to do with this, maybe it had? Regards Rolf