I have a similar problem, yesterday I installed the newest free version of The Events Calender. When I attempt to create a new event and publish it, the event does not display on the calender or the list of upcoming events. On the admin side, it says “no events found” even though it shows that (N) events have been published.
I searched the forum and I think perhaps the problem is with my theme: https://themeforest.net/item/nimble-multipurpose-retina-ready-wordpress-theme/3009347
Somneone can help me?