Netflow - Admin menu wont drop down

Netflow - Admin menu wont drop down

Hello,
 
The admin menu in Netflow V9 wont drop down. this occurs in IE7,8 & 9 and Safari. Is added to local intranet zone and Enabled or Prompt selected for all options for this zone.
Netflow server was restarted with no change.
With script errors turned on getting -
Line: 262
Error: Unable to set value of the property 'innerHTML': object is null or undefined
 
Any ideas?
Thanks, Rob

                New to ADSelfService Plus?