This is probably due to the user not running the correct license key. To check this:
Ribbon View: Click the Access Logo next to the home tab and go to Change Registration Details
Classic/Module View: Click Info and go to Change Registration Details
Once this has been checked on the user, go to a users Dimensions that is not having the issue. Follow the above steps for them as well.
Once you have the right license, follow the article about how to enter new unlocks/license.