I'm now on version 1.42 and my problem was actually (or partially) my own fault. I was using the Tie as a Slur - there is a separate control for that. However, there was a bug with ties across bars causing extraneous output that has been fixed. Thanks to Stephen Wheeler for his prompt follow up to my fallacious bug report, for straightening me out on slurs vs ties (I am not a musician either so that does not help) and for the quick fix of the tie bug.
This version now more accurately depicts what is played out and exported to MIDI.