Is it freezing right after you select which project to open? I'd try deleting the preferences file for your computer under that project. It will regenerate, but you can always back it up to feel safer.
I don't know if you fixed this or not but I just got same message.
I trashed MCState settings and didn't help.
Then I restarted the Mac, zapped Pram while it restarted (hold cmd+opt+p+r until you hear the chime 2 times, I waited for 3).
Then I wanted to open the project with no bins so I held opt+shift while Avid started. I don't know if I needed to hold both, but it asked me what audio I wanted to use, I picked Avid DX, then I had to let go of the keyboard for it to let me navigate to the project, selected it, held opt+shift while opening and it worked!
Opened the project with no bins open and I'm good to go.