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