Sorry, more clarification.   When I go to edit a forum, I would normally click on Forum Administration --> Manage Forums/Groups --> Select the Group --> Edit Forum

In this screen under "General Settings" there are two places that you can cause this popup screen to appear. (Authorized Edit Roles and Authorized Roles)

When I go into the popup, everything appears normal.  I can see the screen, and I can even type something in the "Find" field.  I am unable to do anything whatsoever beyone this functionality though.  I cannot press the Go button, add button, remove button, OK button, or Cancel Button.  This is preventing me from adding additional forums for from changing the permissions on current ones.

I am guessing that there is a problem with the file that controls this popup, but I am unsure what file that is or how to go about fixing it.