However, on this new site, I am getting continual blocking while working in the calendar - front or back-end. I added both of them to the WAF Exceptions area but this made no difference (added using com_<component name>). Moved plugin System - SEF to before plugin System - Admin Tools as per https://www.akeebabackup.com/documentation/admin-tools/wafexceptions.html. Still blocked every time.
Even just advancing to the next month or going back to a previous one IMMEDIATELY results in blacklisting - URL is like - http://www.ckdev.info/atonement/calendar/all-events/calendar?yearID=2015&monthID=10
I've never experienced such an aggressive problem with Admin Tools and anything - it's normally so bulletproof. Right now the site is almost unusable though. I'm just not knowledgeable enough to understand what is triggering Admin Tools.