I have checked and KB4012216 is NOT installed on our Domain Controllers.  

For "good measure" i did follow the workaround instructions for that KB with no change.

This was fine working Yesterday, but when I logged in today there was "No Data Available".   No updates were applied to the server, nor were the domain servers restarted.

Only thing I remember doing yesterday was setting up some email notifications and changing the ADAudit Web Console Admin password from default.