What I'm seeing does not result from competition for ports, as it always happens regardless of whether any other MIDI-capable app is or has been running. Incidentally, it is also the case with BIAB 12. Maybe something with Snow Leopard? It is obviously not a serious problem, more like a nuisance, but there isn't much point in having the app 'remember' the port settings if you have to access the selection dialog to make them work.