Anyone have any experience with the M-Audio Delta Audiophile 2496?  It will intermitently cause delays in playback.  As far as I can tell I have everything set right on both the card and Vegas.  Still, I will hit play and sometimes it will just sit there for 10-30 seconds before it starts playing back.  I have noticed there is some drive activity, but I don't know if that has anything to do with this.  It also seems to be a Vegas issue.  While I'm waiting for playback to start in Vegas 7c I can play the same file immediately in SF6.  Just realized I haven't tried to see if it happens in Acid Pro.  As that has the same mixer it might.
PS - Just has opportunity to check.  It works fine in Acid Pro 6 even while it is stuck in Vegas.  Appears to be a Vegas issue of some sort, perhaps settings.  Any clues on what to look for would be most welcome.