Same problem with StepMania v4.0. 3.9 works fine. Upgraded my PC to Vista Home Premium, now when I launch StepMania, I get a blank screen. I get sound and everything seems to be working (i can hear the cursor moving as I press the arrow keys). System specs: Pentium D Processor (3.6ghz), 2XATI Radeon 3870 (running in crossfire). Latest video drivers. Anything else you need to know?