I've just had to roll back from 3.0 - I use Parallels/Windows primarily to work with MS Expression Blend, a WPF app. This app and the apps I had created UI's in WPF for were not completing their launches and generally failing. Looking forward to a response from Parallels here. Are they aware of the problem? Seems like pretty sloppy testing to let something like this get through into a full release. Btw turning off DirectX Support had no effect.
Coherance not working with WPF apps SO it seems the problem is limited to using these WPF/.NET3.0 apps in Coherence mode. They work fine so far in single window mode, and even when you go from Single Window to Coherence. But they fail if you try to launch them when Parallels is already in Coherence mode.