Thank you for the advice. I consider it. So far I can see that X9 still keeps crashing on MacOS High Sierra 10.13.6. What will happen on Mojave 10.14, we’ll see. The major feature of X9 is a new icon. Ludicrous! Clarivate Analytics sells the new version of EndNote but they don’t improve/fix anything, especially for Mac OS users. Basically, EndNote with its version by version became an expensive subscription service with lousy performance. The upgrade is a waste of money! Still waiting for an answer from Technical Support.