I've stopped using this plugin

The updates seem to be coming directly from the plugin website now and not through WordPress. Since the updated to ‘Standard,’ the calendar has not worked as it should – first conflicting with another addon I use on my websites and then, with the very latest update, just not working at all when trying to set times for events.

I don’t have time to wait for a fix so have moved to Ajax Event Calendar. The support and documentation are readily available and it works as it should.