[Events +] My file editor stops working when I enable events+ plugin

When I enable events+ plugin, my wordpress file editor stops working. If I make changes to a file and update, I get 504 timed out error.

When I run Health Check, I get this

The loopback request to your site failed, this may prevent WP_Cron from working, along with theme and plugin editors.

Also I get this

A plugin has prevented updates by disabling wp_version_check().

If I disable Events+, both these errors are gone and the file editor works fine.