Multiterm does not recognize some terms, both newly added and ones already in the termbase.

This is a question about Studio 2021 and Multiterm 2021. I have not found any discussion about Multiterm issues in the latest version and updates. Multiterm does not recognize some terms in the termbase, both newly added and ones already in the termbase. I can only add about 5 new terms in one sitting, after that, new terms are not added, and "no open termbase" is displayed. I have tried the troubleshooting on repairing your installation on both Multiterm and Studio, and nothing has worked.