I just discovered something interesting. I have Virtual Guitarist (1) installed on my Windows 7 running Cubase 6.5 64 bit and everything works fine and I save the song. If I open that song in my Cubase 6.5 64 bit on Mac OS X 10.6.8 the Virtual Guitarist (1) is missing (Cubase 6.5 can’t open Virtual Guitarist (1) and puts it on the “Vst2xBlacklist Cubase”.) This goes for both 32 and 64 bit.
Then I tried opening the file (still created on Cubase 6.5 64 bit on Windows 7) in Cubase 5.5 32 bit on Mac OS X 10.6.8 and it opens fine! It works! Not of a much use as I make all my new projects in Cubase 6.5 but if needed I can convert the Virtual Guitarist (1) tracks into wav audio in Cubase 5.5 and import the audio into Cubase 6.5.
Still waiting for the Virtual Guitarist working on the latest versions of Cubase… 