Part of a pop up appears on the login page but doesn't show all of it to be able to close it down

AHarman

A small part of a pop up appears on the login page which i think is advertising a "Live Webinar" but doesn't show all of it to be able to accept or close it down. This means i cant log on to the system.

Any one have the same issue? I first noticed it yesterday but still there today.