When trying to open the Symantec Management Platform (SMP) Console on the Notification Server a blank page opens and a notification window appears stating:
"An add-on for this website failed to run."
Opening the SMP Console from another machine via a remote connection works fine.
ITMS 8.x
This was found to be cause by Internet Explorer Settings for ActiveX and javascripting not being enabled.
Enable ActiveX and javascripting under the Internet Settings > Security Tab