Hello,
Please turn off any third part cache module and plugins for yours sites, please turn off all firewall. May be problems with yours security preferences. Please install that to some less security setting site.
Please turn on max error log in Joomla global setting. Please check error console in FireBug extension.
Please try install ours extension for clean joomla site without additional extensions and with default templates, and please start debug from that.
Please try install
Also the translation is not shown in IE9.,
That must not depend from IE9, Or other Browser. Please try turn on debug option in IE setting.
What exactly for IE not work, that aJax or redirect mode ?
Best if you create some demo site where we will can debug that.
Thanks,
OrdaSoft team