Cannot open PT9 Session in PT10 - ""could not complete the open sessions command..."

[median]

I'm an unable to open a client's PT9 Session in PT10. Everytime I try it says, "could not complete the open sessions command because an error occurred" but doesn't say what error. I have tried holding down shift (Windows7 64 PC) so as to disable plugins but I just get a Waves window and the same problem occurs. My client is on Mac but I am on PC. We exported her session using "Save Copy In" and then used a thumb drive. Her track does have plugins on it (some midi instruments, AIR stuff, etc) but we disabled most of them prior to transfer. Oh, I am also using a 512 buffer size. Any help?

Thx