Was the pci slot. I moved the card from slot 7 to pci slot 1 (closest to AGP) and it now works! :P
There maybe timing issues with this card. I've read a number of posts on dvbn that seem to indicate the card doesn't work on some motherboards (not sure if those people tried changing slots though).
My m/b is an Albatron PX845G, P4 2.53ghz. Now works fine with MyTheatre 3.07 and 1.9.0.0 drivers (from
twinhan web site).
Two days of hair ripping to figure this out, hope it helps someone else..
rnm