Unable to add terms to Multiterm during translation


When I set up a new project, I choose the termbase I want. As I translate, Multiterm shows suggested terms as usual. However, when I try to add a new term (Quick Add), Multiterm doesn't respond, and when I choose Add New Term, a new window shows up with available termbases but it keeps "loading..."

Please let me know if you are familiar with any solution to this problem (Studio 2021).