Crash during undo
[Windows Vista, MuseScore ver 0.9.3]
1. Open a score than contains notes with accidentals.
2. Move a note that has an accidental. (so the accidental disappears)
3. Select undo - crash.
Also: the Save command should not be enabled for the 'demo' score unless it has first been 'saved as' something -- and if you do select save you get a rather poor error dialog: "Open Temp File", "failed: No such file or directory." The Save command can be enabled after undo -- for example if you move a note (without an accidental, so you don't get the crash above) and then undo.
[sorry if these have been addressed already, I haven't gotten to downloading the pre-release ver. yet]