I have a project which fails to load about 50% of the time. Here's what happens:
I choose the project. The small window then lists the plugins it is loading. When it gets to "Vintage B3 organ" the progress stops. The app doesn't actually crash, but under Force Quit it lists "Logic Pro (not responding)." I quit Logic and reopen the project, which generally opens successfully on the second try.
Most of the plugins used in this project are stock. There are some 3rd party but only those that haven't caused any problems in the past.
It strikes me as odd that Logic's own code (the organ) would appear to cause the thing to freeze. That's a new one for me.