After upgrading to IE 9 your TMG2010 can show you a lot of problems like below:

forefront-ie9-1.png

forefront-ie9-2.png

 

Below solution from Evgeniya Kotovich:

do backup of file:

Forefront folder/UI_HTMLs/TabsHandler/TangsHandler.htc

edit this file and search for 3 lines with “paddingTop”

put “//” before m_aPages

save file anc check, should work

Below full link to forum:

http://social.technet.microsoft.com/Forums/en-US/Forefrontedgegeneral/thread/bae2d851-6099-4367-a125-b77a2b8a694b/

 

dzbanek 2012-12-24