Suddenly, for no apparent reason the events calendar has stopped working on one of our sites. It has always been slow on the backend, but now it just hangs and often causes an error establishing database connection on the front-end of the site. I've repaired the database already and in an attempt to fix the problem, I just updated to version 2.0.6 of The Events Calendar and 2.0.5 of Pro, and I noticed on activation of Pro I got a warning "Your version of Events Calendar Pro requires version 2.0.5 or higher of The Events Calendar (you are currently running 2.0.6)." But the problem persists. I can access Event Categories, Venues, and Organizers, but not Add Event or Events. Any ideas?