After doing updates through Software and Updates, playing a full screen YouTube video doesn't prevent the screensaver from starting anymore. Before it worked fine.
VLC works fine. It only starts when playing videos online (not just Youtube) - could it be Flash player?
Also Caffeine is not working either in this case, but otherwise it works - it will prevent the screensaver from starting, but not when playing full screen video. I don't understand what could be wrong and how to resolve this issue!
2 Reset to default