Rich:

I presume that for your song, you have enabled "Generate 2 bar Ending for this song" from the "Song Settings" menu. If that's the case, then BIAB is merely "following your orders". You asked it to generate a solo for the middle chorus and ignore the 1st and third.

When it finishes the 3rd chorus, it reverts back to "normal" and therefore generates the solo for the last 2 bars, as they are not really part of the 3rd chorus.

When you create your Solist selection in the Select Soloist window, I used the same settings as you did for "Solo Which Choruses?" but I also clicked the "Custom" button and indicated where EXACTLY I wanted the Solo to be played. That got rid of the extra RT solo in the last 2 bars.

Good luck!
LLOYD S