I've gone through another cycle of uninstall/reinstall, this time putting Quicktime on drive C.

It's now recognised by the BB2Go Dialog ("QuickTime is OK. You have version 7.7.1), and the server is running correctly (but not visible in the system tray - this seems to happen after some reboots and not others).

When I try to generate mp4 file(s) for a selected song in the F:\BB\BB2Go\ folder, I'm told that "Rendering of MIDI is completed. File Saved is named F:\BB\BB2Go\African Waltz C_Render.WAV. FileSize is 0K."

I think that's "zero K", not "Okay", because there's no additional file in the F:\BB\BB2Go folder.