Changing chord symbol definition file with lower case minor selected makes all chords lower case
Ubuntu 14.04, GIT commit: 6478998
Reported in http://musescore.org/en/node/33766#comment-181916, although I've seen variations on this for a while now but never been able to reproduce. The bug was present in the beta and probably going all the way back to a couple of years ago when I implemented the lower case minor chord option.
1) new score
2) enter chord symbol C7
3) Style / General / Chord Symbols
4) enable lower case minor chords and also change to jazz rendering
Result: chord symbol changes to c7 even though this is not a minor chord. However, if you then change any other chord symbol option, it fixes itself. Also if you save / restore. The order of operations is important in reproducing this bug, but there are other variations possible, including first enabling lower case minor chords, hitting OK, then changing to jazz rendering.