Endnote20 NOT responding - have to FORCE QUIT

Hi There, I have just started using endnote20 on a Mac (Catalina os), with Chrome, and Word (latest) and when I go into my Uni library and hit the citation icon, it downloads it but when I open it the coloured wheel goes around and around and the whole thing has to be forced quit, and the citation doesn’t appear. Any suggestions? (Library is 2 days old with 18 journal papers in one group)