Help Desk Replied to me....
“We had to make a change to the transpose functionality a few releases back. If there is ANY text in the lyrics/chords that is surrounded with square brackets, the app now assumes that all chords will be surrounded with square brackets for the purposes of transposition.
If you have a song that will not transpose, check to be sure that one of the following is true:
All chords are surrounded with square brackets (and ideally in-lined into the lyric text)
-OR-
There are no square brackets anywhere in the text.”
I found that, in fact, square bracket pairs cause the problem. As long as the opening [ can find a ] to close it it will stop transpose. This could be used to prevent band mates from transposing. Even if the [ is at the beginning and the ] is at the end, transpose is prevented. I needed only to erase one of the square brackets to get transpose to work. I’m not sure if this will cause problems later if no opening square brackets [ exist in the lyrics but closing square brackets ] do appear.