I've upgraded from 1.414 to 1.415. I did not restarted Jenkins right from the update center (after progress gauge complete), but clicked Managed Jenkins in left menu. This menu was not displayed as was in previous versions, instead I saw the screwed main screen (see attached screen shot of left-top corner). After I restarted Jenkins all went its usual way. I just hope described behavior will not be a usual one, because it's rather uncomfortable to update Jenkins and plugins separately and make 2 restarts of Jenkins (a long restart indeed).