Lost Photo Libraries after Upgrading to Aperture 3

I have lost photo libraries and albums having upgraded from Aperture 2 to Aperture 3 and now can't access the libraries. Although there says that the library contains 8.4 GB of information, there is nothing there when I open it - and I have lost wedding albums for clients that they now want another order from. Unfortunately as Apple doesn't store the albums for longer than 90 days, I can't re-order the album, or locate it in my files. Has anyone had a similar situation and hopefully resolved it? I have tried to repair and rebuild database, but to no avail. Any help would be great - or even a contact number to speak to someone at Apple about this?