The "Add new Term" and "Quick Add new term" are both greyed and cannot be used, even after using them for several years.

The "Add new Term" and "Quick Add new term" are both greyed and cannot be used, even after using them for several years. They turned off when I tried to save a particular term (nothing special), but it turned off my Trados 2017 and they disappeared when the program was re-booted. I have re-installed both the Trados 2017 as well as Multiterm, but the problem remains. There should not be problems with management authority, as suggested by one person to an earlier question, as I have been using this software for a long time.  Any suggestions, please??