I suspect this has happened to you who upgraded to BIAB2009 WITH the REALBAND

I suspect that the REALBAND is the "other program" using the Midi

I sort of verified this by loading and running realband at the same time.

I no longer have the "used by another" error, when I loaded and ran REALBAND in the background while Im using BIAB 2009.

Therefore, temporary solution is, while using BIAB 2009, try to load REALBAND and let it stay in the background doing nothing. The MIDI is then released bec I suspect both BIAB and REALBAND cooperate with each other on the ownership and possession of the midi driver

Try it.