Nothing I've seen has changed. Of course, I am running newer drivers on my systems.
My gut-instinct guess would be that something borked itself up in your video card drivers, so I'd probably start with that. The best option, if you're having trouble, is a full uninstall/reinstall. I'd do this:
0. Download the Guru3D Driver Sweeper program from here:
http://downloads.guru3d.com/Guru3D---Driver-Sweeper-%28Setup%29_d1655.html1. Get Driver Sweeper installed, but don't use it yet. Be careful of the StumbleUpon install while you are going through the install wizard (unless you want StumbleUpon, there's nothing wrong with it).
2. Uninstall the ATI/AMD Catalyst (the whole package) via the Windows
Uninstall a Program Control Panel.
3. Reboot to SAFE MODE (pound F8 like an animal while you are booting, just before the Windows loading splash screen appears, and it'll give you a menu).
4. Run Driver Sweeper from within Safe Mode, check the ATI box, and have it remove what it finds. More info on using Driver Sweeper can be found here:
http://www.guru3d.com/category/driversweeper/5. Reboot back into "normal" Windows.
6. Download the current AMD Drivers for your card here:
http://ati.amd.com/7. Install them.
8. Reboot one last time.
I bet that'll fix you up. However, if it doesn't, you could have something else going on. Haali's splitter has been updated lately and is now much more stable and compatible with Windows 7 (especially 64-bit versions). I'm running the 2010-09-25
beta build of CCCP and it is working fine here, aside from a small issue with Media Player Classic. You could use that if you'd like, or get the individual components yourself.