I don't think that's a problem because when you open the port list for the track, the top half of the list is your soundcard's midi ports and just click the top one and that puts that track back to no synth and that does stick. I just put Forte on a track then removed it that way and no problem.
I've got to get to work but try returning to factory settings, don't select a default synth and just go track by track and afterward remove each synth this way and I think that should work. You would think there should be a way to simply deselect the default without resetting everything but I don't see it.

Bob


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