I been reading a lot of threads, to get familiar with V4, I just upgraded from v3. I am using Vista basic since I only need it to run a few programs for work. But what I have noticed (maybe it me) but it seems most of the people that are having problems are running bootcamp. My MBP is new and I brought v3 at the same time so I never set up or have ran bootcamp. My v4 has work just fine. As a side note; I do agree with most people out there I like the old icon from v3 a lot better. Also to my iSight works fine, but every time I check iSight Vista tries installing a driver. But iSight always seems to work fine.
It is because of Apple implementation of USB, device is getting new address every time, when we pass it to VM