just installed the new drivers today,I haven't had much chance to test them yet,my main reason for updating is due to a couple of my games refusing to run in 5.1 on Vista 32bit,most notably Ataris recent Alone In The Dark,which refuses to load if 5.1 is enabled within the Xonar control panel,have tested this and it's still not fixed unfortuately!
I'll test further later on when home from work and post if any noticable improvements or new problems are apparent.
By the way is anyone else having similar problems with Alone The Dark on the Xonar and Vista? I'm using the D2X version of the card.