Hi Michelle,
Sorry to hear the hover tooltip isn’t working properly.
There is an update for PRO available, though it might not be showing in your WordPress > Plugins page. Can you visit WordPress > Plugins and see if the update displays under ‘Update Available‘? (see bottom right-hand corner of screenshot below for reference)

If you don’t see anything there, visit your Downloads page and download version 4.3.1.1 and update manually.
Once that’s done, can you please revert back to the default WP theme, deactivate all plugins other than ours, then set ‘wp_debug‘ to ‘TRUE’ on your wp-config.php file to see if any errors display at the top of your /upcoming-events/ page?
Please let me know if you have any questions on the procedures I’ve outlined and the results of your tests. Once I have a little more info, I’ll have a better idea on what the problem is and some possible solutions. As of right now, I’m not seeing any bug reports relating to your issue.
Thanks for working with me on the issue and have a good evening. Cheers!