another idea ... (you mentioning GS sitting on the same machine) ... try to set GS to use channels 3/4 (or above) to free up 1/2 for the VI, possibly there is also another app sitting on the ASIO driver. we've noticed this with cubase and RME (although they claim their drivers to be multi client)
christian
christian
and remember: only a CRAY can run an endless loop in just three seconds.