Hi Mac, thanks for answering.

UAC is off. A machine reboot made no difference. The Options->Return to Factory Settings has got rid of the Access Violation box. :-)

Sadly, the resultant .mid file still will not load into Ableton nor play on a MIDI player program (VanBasco). What else can I try? It's a one-track-per instrument MIDI I am outputting, which is what's worked before.