My setup: 15" MacBook Pro, 2GB RAM Parallels Desktop build 5540 Beta (I do have a valid license though) VM is Vista 32bit installed on a Boot Camp partition VM has 1GB RAM and 64MB VRAM "Enable DirectX Shaders" is checked Symptoms: Vista does not show any of its "glass" effects -- no window transparency or anything. DXDiag says DirectDraw Acceleration and Direct3D Acceleration is enabled. Resolution is set to 1280x1024. Steam runs okay. When launching "Portal" (based on the Half Life 2 engine), Steam says "Video Driver Outdated", but says I can continue anyway. It says I'm using "Direct3D HAL" 18.104.22.1689. The game starts up and shows the Valve logos, but goes haywire when switching to full screen mode, switching in and out of full screen in a loop. Any ideas? The game runs fine when I run it from Boot Camp.