I know it sounds unlikely, I couldn't believe it myself ...
to answer your question, no I am using MSI Neo 2 Mobo (P4), Intel Bus master.
still baffled to be honest... another new DVD which worked without problems : Shrek2.
I thought this might be purely an audio codec issue, but since i've completely stripped those and readded them (K-Lite code pack), I ruled that idea out, and if it were a codec issue then surely i'd have the same problem with anything I played, right?
Thanks for any continued ideas