In order to confirm you have a theme conflict, please follow the steps provided here: Do I have a Theme or Plugin Conflict?

1. Some theme conflicts can be solved by selecting this option in your WP Dashboard>Events>Settings:

This may resolve your theme issue, in particular this has resolved conflicts with the Gonzo and Simplicity themes, as well as some others.

3. Check that the theme has a call to wp_footer() in footer.php

One way to check to see if your theme has the call for wp_footer is to go to Themes > Editor and open footer.php. Right at the bottom there should be code that says <?php wp_footer(); ?>

This example is from the TwentyEleven theme from WordPress.

If your theme does not have this file, please contact your theme developer and ask them how to include it.

4. ​For themes with issues on the Event Details page, please make sure your theme supports Custom Post Types.  For more information about this, please see this support article about changes not appearing.

5. If you have premium support included in your calendar package, submit a support ticket and our dedicated support team will take a closer look at what is occurring and try to assist you in resolving the conflict.