This page will be updated as compatibility issues are found with other Joomla extensions.
Akeeba Admin Tools Professional
Symptom: Calendar browser does not work properly when AJAX mode is enabled.
Solution: Make the following change from the option Admin Tools -> Security -> Web Application Firewall -> Configure WAF:
Under the item "List of allowed tmpl= keywords" add "zcalendar" to the comma delimited list, i.e. "component,system,raw,zcalendar"