I haven't heard of any specific problems, but support has not officially been added for Windows XP yet. We will be updating our programs as necessary to add support for Windows XP.
Vegas Video 2.0h(the latest update) and SF5.0d, both
work well in XP. In fact, with the latest updates and
XP(RC1) Vegas Video 2.0h, SF5.0d and ACID 3.0c can now
recognize my Delta 66(WDM 5.12.1.25) drivers as 24bit
for playback & recording. A pleasant surprise to say the least, since SF products are not "officially" WDM
certified. It is important to me since I use my SF apps and Cakewalks SONAR with WDM drivers on the same machine.