Whoops, and another one.
I just restarted MM, opened a tab and clicked on the entire library artist node. It felt like MM crashed when it was loading the artist sub-nodes. Not sure.
Here's the error message:
EDIT:
I was able to reproduce the error with the debug version as well. Log 2AB30000 was sent.
I am going to try to catch it with debug viewer next.
EDIT 2:
Ticket #7557 with log file submitted. Happy bug hunting.

If there is anything else I could try to help, let me know.