dostana In my opinion, it's basically the same issue as described in the "Applications cannot launch from Panel" thread. If you continuously open programs from the panel, after a while the problem arises. I hoped that it would be fixed with the last updates, but unfortunately, it hasn't. I suggest that you don't start any of the programs from the panel for now. Always either start from the applications launcher or from the desktop icons (if you have desktop icons). When you are finished with your session, then you can shutdown using the panel, but only use the panel to shutdown, nothing else. That's how I manage to avoid the problem from happening or reoccurring for now. And if your system does get stuck, then hit CTRL+ALT+ DEL simultaneously until the shutdown window appears. Then click on shutdown, and your system will shutdown as it should. It seems to work for me. Cheers.