I am not sure why this has started occurring but I have been using the same JoomlArt template with Admin Tools but I believe the last update has some issues with it. JoomlArt has a feature called MegaMenu in the Template Manager and for some odd reason the menu's never seem to load. After I've tried to reload the page, Admin Tools then blocks me.
So far I looked into the Security log to see if it was an issue with e component however even after I have added com_templates to the WAF Exception list, it still bans me. I disabled the Admin Tools plugin and then I was able to get the mega menu feature to load.