Endnote X9 CWYW - blank lines in search (macOS 10.14)?

I have never experienced this before, but using CWYW in Word 2016 to insert a citation results in blank lines in the search field. This is very strange, because I noticed that just typing a single letter gives results. If you click in the blank search results window, or just use arrow keys you will se that the results are there, since the preview of the selected line at the bottom is correct! And the citation is being inserted in the Word document…

Very annoying nonethless. Has anyone else experienced this? This mac was just updated to 10.14 from 10.11. Endnote X9 was already installed. I tried to delete user preferences in the home Library folder and to create a new library, with the same result.

Word 2016 was just installed, so it must have been the most recent version, most probably 16.19.0. I also tried to run the customizer to reinstall CWYW, but it did not help