Unable to get property 'PageRequestManager' of undefined or null reference

This fix http://support.microsoft.com/kb/2600088 is already installed under our .NetFramework install of 4.5 and it contains all the updates that should fix this issue according to this link

http://social.msdn.microsoft.com/Forums/ie/en-US/16fa6eb9-255c-4d92-a183-06d8ed2fc8f6/dopostback-is-undefined-in-ie-10-browser-for-link-button?forum=iewebdevelopment

But, my user is still getting this error Unable to get property 'PageRequestManager' of undefined or null reference when doing some testing on a interface. We're are running Windows Server 2008 R2 SP1 on a terminal server. Can you provide any addl. suggestions on how to resolve this?