GP 2013 R2 Error - A get/change first operation on table 'sysUserDefaults' failed accessing SQL data

We have a user that is unable to login to our test GP server due to the error above. SA can login fine. I tried clearing user access to all companies and then re-adding but did not work. Reset password, verified user is setup correctly. This has happened previously to users when restoring productions data to the test server but former admin did not leave steps to resolve. This user has not logged into the test server since before the last production to test migration so he is the only one experiencing the issue at this time. I did find an article on running the Grant.sql script but am unsure of implications to other users if I do this. Any insight would be appreciated!