I have a had a similar problem with rendering and playback (Win7 BIAB 2010) and solved part of the problem by getting the latest update which installs coyotewavetableDXi. See forum "midi to wave C:\bb\STOMBBX.EXE" I now have the problem that the wave file only plays the first 8 bars.
If i get any more info. i will let you know.

Culfy