Crash on deleting all notes from part with mmrests; corruption on undo when doing same in score
Ubuntu Studio 14.04, GIT commit: 9c9a464
1) new score, or use default
2) enter one or mote notes
3) "M" to enable mm rests
4) select all
Depending on whether you actually select all or just the one measure where you entered notes, the specifics of the crash differ.