Whoops! I just upgraded the firmware to Dahua while I was killing time. All functions work from all web browsers.
Now my bad news to me: I can no longer use the Amcrest app to view the camera. (although it still works fine with iSpyconnect)
I would like to get the Amcrest FW back on there and it's failing :/
Honestly, it's my oldest camera and happened to be the only one I couldn't access the 'video' config from Chrome/Firefox.
If I manage to get the Amcrest FW back on there, I WILL give it a go with IE-11, Thanks!