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Start vmpk, select Edit->MIDI Setup. Change the "MIDI Output Driver" to anything other than Fluidsynth (the default). The application hangs. Any further attempt to use it will pop up a dialog saying "MIDI Setup is not responding".
I cannot reproduce this issue. Is there any other program that producing sound, like Amarok?
I had jack and probably some synth (maybe amsynth) running. I attempted to reproduce just now and couldn't. I don't know what changed. I'm seeing some random freezes (stuttering, then cpu fan spins up and I have to force quit it) while trying to use it to play pianoteq; but a few minutes later I'm not able to reproduce that either. Best is probably to close for now?