Purchased and installed my upgrade from 2009.5 to 2010 this week. Right away this anomaly showed up:

In previous versions, I found the best audio setup for using BIAB and my MIDI keyboard controllers was (1) BIAB setting as MME, and (2) MIDI keyboard setting as ASIO. Ketron SD2 as MIDI sound module; Echo Indigo laptop soundcard.
This has worked perfectly for quite some time.

Not this time.

I fooled around trying to get rid of the constant "...wave file not found, another program may be using ..." error message on playing any BIAB output. Tried standalone MIDI output (I use Pianoteq and True Pianos and a couple others). Tried using my host Forte Ensemble and VSTI setups. No go. Typically I get the error message in BIAB on selecting PLAY, but a few seconds later, it in fact does begin to play my selection. Error message reappears on replay.

Finally, I switched BIAB over to ASIO and the MIDI controllers to MME. Success. At least so far. MIDI module output through the SD2 seems right on, no latency problems that I see, and volume control, etc. OK. Error message gone.

So -- I'm back in business at the moment, but I'm left wondering what's happened between versions to change things? And I was always under the impression that MME for BIAB was the optimum setup?

Thought maybe one of you really sharp forum members might experiment shed some light. And thank you, as usual.