Howdy Charles,
I would love to help you with this. First I just need to make sure we are on the same page.
You mention a category widget. That does not sound like something that is part of our plugin. Do you know what the category widget is and where it comes from, perhaps it’s part of your theme or a third party plugin?
Also, 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 determine what might be happening.
Cheers!
– Brook