Control: found -1 5.6.0~beta+dfsg-2 The problem with the mouse still occurs with libqt5widgets5 from experimental (I can't try the screen since I've just my laptop).
1. Run ./helloworld 2. Move to another desktop page (my window manager: fvwm). 3. Unplug USB mouse. Optional: 4. Plug it in again. Optional: 5. Move to the initial desktop page. The helloworld window appears correctly, so that's an improvement. And clicking on it doesn't yield a crash. 6. Click on the root window (either with the left button of the touchpad, or with the left button of the USB mouse if (4) has been done). No effect! 7. Kill the helloworld process. The click on the root window works again. -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)