Well, I encouraged the Synthogy guys to check out this thread to see if there was anything they could chime in on. They responded and basically said they had read the thread and since Ivory works with other hosts on my machine, that it would need to be solved on VSL's end.
I'm surprised no other users have chimed in. Isn't anyone else using VEPro 64 and Ivory 64 on Win7 64?
I guess I'll try to squeeze Ivory natively into my DAW in the meantime till this gets sorted out. Too bad though, it takes a lot of memory. I'll keep my fingers crossed for a fix.