[Trunk] Closing a playing score with impending save, cancel and stopping score causes crash

There was a string of crashes related to the closing of a score (also others, but they may have been CPU related), but these are steps I was able to reproduce a few times. However, upon testing it again, I sometimes can't.

There wasn't a crash, but in trying something similar to these steps, I was prompted with 'command copy not valid in current state'.

I wonder if there's more precise steps...

I was able to reproduce, but now I can't. However, I found that sometimes step 7 wasn't required.

Using MuseScore 2.0 Nightly Build (4791) - Mac 10.6.8.

I'm still able to reproduce sometimes. Can anyone else?

Maybe a debug version could help, but I don't know how to build one. Maybe someone could create and send one for me to send back the results?

Using MuseScore 2.0 Nightly Build (4822) - Mac 10.6.8.

Here's the crash logs from a debug launch of the program.

Uploaded a screencast , though I'm not sure it'll help.

Also see: #13418: [Trunk] Closing a newly-created score during playback of another and stopping causes crash

Could be related.

I saved a score and played it. When I stopped playback, it crashed.

Using MuseScore 2.0 Nightly Build (5212) - Mac 10.6.8.

I created a score and during playback, I stopped and it crashed.

Here's the crash log .

Using MuseScore 2.0 Nightly Build (5396) - Mac 10.6.8.

This may have been fixed (https://github.com/musescore/MuseScore/commit/25bfd0d)?

I believe it's fixed.

Using MuseScore 2.0 Nightly Build (a8a7c0b) - Mac 10.7.4.