In my media player, there is an option to change the video output method. Apparently, it uses an overlay to display the video, and this disables the Aero theme. This problem has nothing to do with Opera, but merely with the media player. You state that the problem appears as soon as you click on a RealPlayer video link on a site in your Opera browser. From a newsgroup post: 'I noticed this problem in Vista with Aero enabled. Description A request to disable the Desktop Window Manager was made by process (). Were there any videos being played just prior to this behavior? I found the following: *Event ID: 9010. Hi Johnson There doesn't appear to be a lot of information on this particular problem. Is there any conflict or issues between the any programs(esp WMP12) i was using that caused the WinSAT to act by itself? Regards WMP 12 had already played 52 songs with average 2 hours done. My WinSAT score was also in need of being refreshed but i ignored that. I navigated to the logs in Control Panel and i found this 2 suspicious entries which is related to the incident: Entry 1: 'A request to disable the Desktop Window Manager was made by process (Windows System Assessment Tool)' Source: Desktop Window Manager Event ID: 9010 Entry 2: 'The Desktop Window Manager was unable to start because composition was disabled by a running application' Souce: Desktop Window Manager Event ID: 9013 However, i am very sure i did not initiate Windows System Assessment Tool at all. However just as Windows Media Player 12 terminated Windows Aero returned and my theme was back to normal. Naturally, i attempted to restart to see if the problem would go away by itself. At the point of time of instance, i was surfing the Internet with Mozilla Firefox and playing an album of song in Windows Media Player 12.

I have noticed one very peculiar issue - my Desktop Windows Manager(aka Windows Aero) suddenly terminated by itself a while ago, and my theme became Windows 7 Basic's.

Windows system assessment tool