Comment 59 for bug 1247235

I re-enabled the kubuntu ppa yesterday after it was disabled for a month or so (since upgrade to Saucy), and upgrded to 4.11.3. Today something bad happened to my desktop of the sort I haven't seen in quite some time. By 'something bad' I mean the panel disappeared, as did window titles and minimize/maximize buttons, alt-tab didn't work (I could only switch apps by closing them one by one), applications' main menu didn't open neither when clicked nor with keyboard shortcut e.g. alt-f for file menu (but application window body such as firefox tab content seemed ok), etc. I had to ctrl-alt-f1 into console and mess around a bit with kwin and ksmserver until I eventually managed to do a graceful reboot of the pc without losing my open work (I hope). Not sure what component that is that broke, maybe kwin. Coincidence?