I created a file (pure MIDI, no audio).
Playing it in Power Tracks causes a "Division by zero at:" message and Power Tracks freezes solid.

I have to close down the program and re-launch.

But ONLY if MIDI playback is rerouted to CoyoteWT as default Dxi/VSTi synth.

If MIDI playback is ported anywhere else, the file plays normally.

Is there a known bug in CoyoteWT that would cause this problem?

Perhaps some continuous controller messages that it doesn't like?