Howdy Mike,
I would love to help you with this. This is an intriguing issue.
Would you mind grabbing your system information and pasting it here? Make sure to use the ‘Set as private reply’ checkbox to protect your private information from the public. You can find the system info by going to WP Admin > Events > Settings, clicking on the “Help” tab, and scrolling down to the ‘System Information’ box. (Or by going to [yoursite]/wp-admin/edit.php?post_type=tribe_events&page=tribe-events-calendar&tab=help) That will give me a lot of extra information to help diagnose the problem.
Cheers!
– Brook