I installed Vista RC1 (build 5600) today on my 2.0 GHz iMac Core Duo. For some reason, "old" software like Firefox, iTunes, Yahoo! Messenger, etc, is big and blurry, like it's not running at the monitors native resolution when running the Aero interface. If I switch to classic theme, everything's fine. The windows get smaller and aren't blurry anymore. Even in Aero, inclued applications, system dialogs, etc look fine. I installed the Radeon driver for Vista that ATI has on their website, but that didn't fix it. Has anyone else seen this problem? Is there anyway to fix it?