Well, here's what I have...
v18.104.22.168 Pro Platinum on XP SP3, 4G RAM, nVidia driver 197.13, two 260's in SLI on a DX58SO mb.
Even though the pop-up box states that the system is RedSDK compatible, RedSDK is not functional/usable on this setup - I now run in GDI mode. With RedSDK I get (in the drawing area) either a totally white or a totally black screen. Menu's/mouse generally all remain functional.
As Aram wrote, I hope this wasn't just a "white elephant" feature.
Any feedback appreciated.