@domovnik: V7 Notes, and no access...

I have a problem with Youtube videos. Since yesterday YT videos are not loading anymore, and all I see is a black square. Some setting most be corrupted, because a new clean USB installation doesn't have this problem. Any ideas?
Never mind. Fixed

I have a problem with pref>adv>programs>Check if Opera is def. browser>Details section. All the are marked and I can't unmark them. This is causing problems with some websites. Here are the images of the current status and how it should be.

Image 1

Image 2