https://bugs.kde.org/show_bug.cgi?id=372039
--- Comment #27 from Martin Gräßlin <mgraess...@kde.org> --- I think I see what's going on: KWin is crashing. And given the screenshot: please switch the window decoration to the default Breeze. As you are using siduction you are hit by a bug in current Debian testing/unstable: they misbuild kwin and by that switched to a window decoration which is unfortunately known to crash. -- You are receiving this mail because: You are watching all bug changes.