Jsh3D, I had to upgrade to Service pack 6a when I got Premiere 6, and haven't had any problems with any of the versions of XSI installed on my system (1.0 through 2.01 -- haven't downloaded and installed 2.02 yet). Judging from what I'd read at the time, the main thing with Servicepack 6a is that it implements some Direct X stuff necessary for real time features in programs like Premiere 6, but I assume since XSI utilizes OGL for the viewports that there's no compatibility problem. Like I said, I haven't had any problems in the 6+ months I've been running 6a.