Plugin incompatible with Event Calendar WD Plugin

While I am logged in, the Event Calendar WD plugin works perfectly. That is to say when I click on the next month the calendar displays the new month in about 4 seconds. But when I log out the calendar does not display the next month and in about 20 seconds it produces a blank screen.
The original problem identified by the plugin developer was a ‘failure of AJAX response from the server’. I do not know if this is still the case.
https://wncfreedomcenter.org/calendar/
This plugin has produced three bugs (that I have reported) that are serious. The removal of this plugin resolved the other issue instantly.
Here is the link to the other support issue with Event Calendar WD
Site