Can you open the program successfully from a shortcut? If so, open Pr and try importing the saved project into a new project.
I am still able to open the program if I create new files, it's opening old files that causes the crash.
I'm hoping for some help though on solving the crashing on quit issue. It happens 100% of the time with every new project created. When I go to exit the program, boom, crash.
Launch Pr from a shortcut while holding the Shift+Opt keys down. Hold them down until you see the Welcome screen. That'll reset the plug-in cache and your preferences.
Then create a new project, do some quick importing and editing and save the project. Then try and quit Pr. I always close the project before quitting, so you may want to try that to see if it works for you.