Hours of lost work after a MuseScore crash
I was reading the forum post about whole-measure rests in voices other than 1, and decided to try it on one of my own scores (FWIW I had independently discovered the "exchange voices" hack). I then selected "save" from the file menu and MuseScore crashed, bringing up me the "program is not responding" Windows dialog box, and I selected the "close" option. When I restarted MuseScore it popped up a dialog saying that the previous session had terminated abnormally, and I selected the option to restore the session.
When MuseScore opened, it displayed a blank screen (no open files), so I manually opened the file I'd been working on when the crash occurred, and discovered that I'd lost about 6 to 8 hours' worth of work. It turns out the version of the file in the MuseScore2/Scores directory is dated last night at about 5 pm (i.e., over 21 hours ago) and the backup file in the same directory is even older. I also checked the session directory (AppData/Local/MuseScore/MuseScore2) and the most recent backup file there is almost as old: 6:30 pm yesterday. All the changes I made since that time are gone, and I'm certain I saved many times since yesterday afternoon.
I'm very distressed about this. Any idea what happened? Any chance of recovering any of my lost work?
I'm running MuseScore 2.0 on WIndows 8.1.