Any idea why I get these errors in the web console when I try to look at the megamenu in the back end of Joomla. Screenshot attached - as you can see the menu is not displayed.

"NetworkError: 499 Request has been forbidden by antivirus - http://xxxx.xxxxxx.com/plugins/system/t3/admin/megamenu/images/grid-bg.jpg"
grid-bg.jpg
"NetworkError: 499 Request has been forbidden by antivirus - http://xxxx.xxxxxx.com/?t3action=megamenu&t3task=display&styleid=9&template=lavida&t3menu=mainmenu&t3acl=1&t3lang=*&rand=0.5652889475038159"
?t3acti...5038159

I have no idea why an anti virus program would block anything from a T3 framwork. No other T3 assets are blocked. Whitelisting the domain cured the problem but why did i have it in the first place ?

j3.5.1. - php 7 - up to date T3 framework