I have a 1250 and a 2250 in my Media Center PC. Both work fine. Have you told Hauppauge that you are able to play DVD's in Media Center? They are probably thinking that the driver bug in the nVidia drivers is the culprit. That's what I thought when I first replied to your post too... until you told me that you can play DVD's.
System Manufacturer/Model Number HP Pavilion Elite 495UK OS Windows 7 Ultimate SP1 64-Bit CPU Intel Core i7 870 @ 2.93GHz Motherboard MSI 2A9C (CPU1) Memory 8Gb Dual-Channel DDR3 @ 664MHz Graphics Card nVidia GeForce GTX 460 1024MB dedicated RAM Sound Card Realtek HD Audio Monitor(s) Displays HP2310i Screen Resolution 1920 x 1080
Keyboard Logitech K750 solar-powered keyboard Mouse Logitech Wireless M180 mouse PSU 460W Case HP Elite Cooling Air cooled Hard Drives 1x1954GB Hitachi HDS22020ALA 330 (RAID), 1x1954GB Hitachi External for backup and storage Internet Speed 2Mb Other Info Pure Avanti Flow Internet Radio with iPod Dock, 64Gb iPod, HP USB Speakers, Sony MDR-V500 Headphones, Sony Vaio F-Series Laptop