I recently installed Votive on Vista and noticed that the project templates weren't showing up when going to File/New Project/WiX. I haven't dug into it deeply yet, but I suspect that it has to do with running devenv.exe /setup as part of the setup and devenv.exe is not being run as an administrator. Consequently, it didn't get set up correctly. I'll be looking into it in more detail and fixing it, but in the meantime you can do a really simple workaround:
That should fix the problem and you should now see the project templates.