Civilization 3 and Noiseboyuk,
I've found that in my VEP6 setups that I converted to VEP7, I had to go in and carefully reselect/replace plugins/instruments like UVI and Slate Drums to the AU versions to make everything work right. _then you have to save the VEP instances before you save the Server Project, which will be new.
As with VSL/VEP6, on a new install I first review and refresh the sample libraries via Directory Manager.
I then move onto opening the non-server versions of the VEP (now 7) bundle so that the plugins all get rescanned and any buffers, sample rates, numbre of midi channels, and nuber of audio i/o are set according to my preferences.
Another thing with a lot of 3rd party VI's is that you need to open the library settings within those plugins as well, making sure everything is just so. There have been times when I build a new setup and I forget to do all of that gruntwork, especially dreading Waves and UAD plugin rescans. I just try to get it in there while everything is fresh. Something scripted would be a much better way.