I use a EMU 1212M with GVI and do not have any problems.
I have a Windows XP machine, Athlon 64 dual core with 4 Gigs of Ram.
I also run Kontakt 2 and 3 and the 1212M does just fine. Incidently, I am currently using the BETA version EMU drivers which are their latest release.
On what forums have your read that this compatibility problem exists??
There was some discussion on a Harmony Central forum in a thread about the EMU Emulator X2, Giga import, etc., but it was at least a year or so old so I was curious if the situation had improved since then. From your experience, either the problem was an isolated incident, although it didn't appear to be at that time, or things have improved and I'm glad to hear it. I was afraid all my Giga libs might get stuck on the shelf.