Overscan problem

I recently got a new 60 inch panasonic plasma TV and also upgrade to an ATI 6570 video card. I'm having a problem with overscan settings. I have the overscan set fine within catalyst control (ver 12.6), such that the desktop look fine and fills the screen with the resolution set to 1080p and overscan set to 0%. However I've found that for certain applications that use a full screen exclusive setting, the display does not fill the entire panel and appears as if the overscan is set to what was the default in catalys (middle between 15% and 0%) leaving black bars around the entire image.

I first noticed this when I setup google photo screen saver and saw the same problem with microsoft's equivalent. I gave up on those and found a third party screen saver that works fine, but today I set SageTV to full screen exclusive, and this caused Sage to have the same effect; a black bar that doesn't fill the entire screen. I can't seem to find any setting that differentiates the overscan setting for apps that use full screen exclusive and those that don't. Anyone know how to fix this?

Incidently, and on a somewhat related note, I was trying full screen exclusive with SageTV because I hate having the few pixel high white/grey taskbar is always visible in SageTV and in Cyberlink DVD.

I haven't tried different versiions of catalyst yet.