Mac Enharmonic Correction
When messing with transposition up and down random intervals, upon fixing several parts are locked with double flats. Enharmonic fixer key (J) does not work for F double flat or C double flat, and requires manual movement to the correct enharmonic. Perhaps this is an enharmonic recognition issue, or a double flat issue. Regardless, it's a pain to have to move them all individually and changing the key signature doesn't automatically fix it, as it probably should.
By the way, I don't mean to sound ungrateful. Musescore is awesome, keep up the great work!