Multiterm 2017 doesn't allow adding a term

Initially, I had updated to the most recent version, which might be referred as CU6. After that I having all sorts of problems.

Whenever I tried to added a new term in multiterm or studio, an error message showed up, saying

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The strange thing is sometimes, the new term is added even with the error message, and other times not.

The only way I can add a new term without an error is by selecting the words in source and target and use quick add function

After searching this forum, I found my problem might be due to the latest update. So I tried to follow the suggest workaround, but no CU 6 update is listed in my windows 10 App list.

Then, I removed the entire multiterm 2017 suit and reinstalled with auto update off. Now, after hitting F3 to add a new term in multiterm, I tried to add an entry by typing in, but nothing happened. Simply, the entry I just typed in disappears.

With these problems, I can't use termbase anymore. Can you help me with this?