The newest weekly build of WiX v3 3.0.4220.0 causes some problems in Visual Studio 2008 if you're using the votive integration.
In my installation, votive reproducable causes problems with sourcecontrol integration. I'm using the TFS Client. After installing votive, automatic checkout while editing is not working anymore in any project. In the votive project itself, almost every button for TFS is disabled.
Hope the next version of WiX is better, as WiX is a fantastic installer generator for the windows world.