How to fix broken admin Thickbox?

Update: I fixed the issue myself. The problem was resulting from where I had removed jQuery output from the front end of my site (using my own version) improperly. It was not an issue with WordPress itself. The function I was using to unset it removed it from the admin as well. I hadn’t realized that some of the hooks that can be accessed in the functions.php file can affect the admin as well as the front-end.