While creating a new solution, the file starting to freeze up when I try to access Part Definition. I have to use Ctrl+Alt+Delete to close the program. It only occurs on this one file. File Recovery did not work, and saving as a compressed file did not work. Computer reboot did not work. What can I do?

If you create another new solution from scratch, does it still do it.  If not, you may have to revert to a backup that doesn't do it, or scrap the file and start over.

When I was using 12, any file I made would freeze up when I tried to modify the toolbar.  Any file I got off the internet would not.  I tried uninstall, reinstall, even reported as a bug.  It never got resolved.