Dynamics GP - Unable to open customizations dictionary

Problem:
This is happening because someone has Dynamics GP open on their machine.

Solution:
Make sure no one is actually using the system, or doing work before kicking them out, or just killing GP.
Any one of the following will work

1. Ask all users to log out and CLOSE GP
2. Disable the network connection to kill all connections to the file, then re-enable it
3. If you're on a terminal server, open the task manager, show processes from all users and kill all instances of dynamics*32.exe