I have this file that my user is not able to properly use.
When I open it on my computer, it functions fine, but on his, he is missing Add-In tab to be able to choose certain properties.
I have looked at his settings in Option-> Add-Ins, Trust Center-> Add-Ins, and any other places I can think of, including customize tabs. Add-In tab is enabled, but still not visible.
He did not have an issue until he started to work with this file, I am attaching it in hopes that this gives a clue. password is 600Summer.