I'm using MMF2 build 242. In my game, if lots of sounds are played at the same time, the sound completely spazzes up and all that can be heard is high-pitch squeals. This only rights itself after restarting the computer: it messes up all of the sound for every application, not just mmf.
My sound card is an SB Audigy 2, capable of handling cubase, EAX, but apparently not MMF
I can mail clickteam the problem file if they need.