Customer has windows 7 and is trying to use a Terminal Service VPN webapp. When it is launched a pop up shows the message : Missing TSC ActiveX Control(s). Click the Information Bar to allow Installation of TSC ActiveX control 

System check says that things are fine and the RDP control is installed.

This means that IE8 is currently in IE7 compatibility mode. Click on the broken page link next to the refresh button in ie to take it out of compatibility mode.