Perhaps Nvidia are just waiting for the real operating system to be released? and who could blame them if they were??
Probably gamers like us. I had noticed that most of the people reporting spikey graphics were using Nvidia cards, including myself. That's where I generally place the brunt of the blame for my graphical glitches. Side note, I just installed the new patch that was attempting to resolve that issue, but failed. I'll get around to sending my debug and savegame file after I get back from work tonight.
I'm not angry at Stardock as such, mostly at myself for failing to check the "auto archive" option in SDC before patching to beta4. As it stands I'll have to shelve my use of DA for a while because my greatest joy was making custom ships, which is really hard to do when you get random light sabers and such jutting out of the hull. I suppose on the plus side it allows me to get back to tinkering with NWN1. And I never really believed that Vista would be good for anything, which is why I'm sooper-happy that I got my new computer *before* vendors started forcing down people's throats.