Something I’ve noticed is that when you click to the next month, it directs you to a new page. However, in the Events Calendar Pro demo, you stay on the same page and the calendar updates only. I think the issue is that because the plugin is Javascript/AJAX based, it cannot remember the selected filter on a new page (because the plugin itself is being refreshed).
EBMC Calendar: http://ebmcnew.pairsite.com/calendar/
Demo Calendar: http://wpshindig.com/events/month/
I think the issue is the calendar itself. When you click to view the next month, the calendar should populate rather than re-direct to a new page.
Suggestions?