MIDIs seem to be working normally, Richard. I don't know what it is, but it seems that people have a lot of problem with MIDI, and with sound in general. I think it's because there are so many different programs nowadays that play sounds, and some of them conflict. The worst offender I've found is Crescendo. If you have it, it might be an idea to uninstall it and see if that does the trick.
-Joe Offer-