Windows 7: WMC Screen Saver turns off

Not sure if this is a WMC/Windows 7 issue or a TV issue.

I have an HTPC hooked up to a TV via an HDMI matrix. When I run the screensave (photo gallery) on my WMC I lose the signal to the TV very 20-25 minutes. I know this as I get a "No Signal" message. When I click on the keyboard the signal resets. This does not occur if I am watching a movie in WMC. Only when the screen save is running.

I don't seem to get this when I run the screen saver (photo gallery) on Apple TV through the same TV. It plays indefinately.

Is there a setting in WMC that turns off the screen saver slide show?

Or is this a problem with my TV/Signal?

Thanks

I am wondering if this has something to do with AMD Catalyst 12.4. I just recently upgraded to this. In the past I could run my HTPC and simply leave it on. There were never any "No Signal" errors on my TV screen. In the previous post I noted that when I run my AppleTV, I don't get any issues. Could there be a setting in AMD Catalyst 12.4 which cuts the signal after a certain amount of time?

Thanks