My point is that before BIAB 2014 there was a prompt when changing the style from Swing to Latin in a song originally entered with a Swing feel, and that if the option was accepted the song's notation and audio output would switch to Latin.

In BIAB 2014 when you change from a Swing style to a Latin style, although Triplet feel option is automatically switched off, the audio output remains "swung" although the notation changes to a dotted eighth-note and sixteenth note presentation.

This is most obvious when you listen to Bar 17 of the MGU file I sent you.

If you choose to edit the notes of this bar in Swing and Bossa modes, you'll find that the start point and duration of each note is identical - the first note starts at Bar 17, note 1, tick 1 and lasts 64 ticks, and the second starts at Bar 17, note 1 tick 81 and lasts 32 ticks.

I don't have access to an older version of BIAB at present, but I expect that when the prompt "do you wish to change to straight eight feel" is accepted, adjustments are made to the durations and starting points of the notes which makes the notation and the audio output fit with a latin feel.

May I crave your indulgence, and ask you to check this on your setup? If you can confirm my findings, I'll report it as a bug.

Michael