Hi there, Mark! Welcome to the forums. 🙂
That’s certainly odd! Will you please try running through the steps in our troubleshooting guide? I want to test for conflicts with your current theme and any other installed plugins.
The major red flag to me is that your calendar lives here:
http://www.cmzoo.org/index.php/cmzoo_events/category/zoo-events/list/
…but when performing a search, it goes here:
http://www.cmzoo.org/index.php/cmzoo_events/category/zoo-events/list/index.php/http://www.cmzoo.org/cmzoo_events/category/zoo-events/list?post_type=tribe_events&tribe_events_cat=zoo-events&eventDisplay=list
Notice that the search parameters are not in the URL. A correct URL would look something like this:
http://www.cmzoo.org/index.php/cmzoo_events/category/concert/list/?action=tribe_list&tribe_paged=1&tribe_event_display=list&tribe-bar-date=2015-12-01
In fact, following that last link does take you to the correct page that should be coming up. That makes me wonder if there is a conflict at play, and those testing steps will help identify where it’s coming from,
Let’s start there and see what we find. 🙂
Cheers!
Geoff