I restored advanced setting and reset IE settings (Tools > Internet Options > Advanced) and rebooted. The problem did not go away.
I tested from another Win 7-x64 PC with IE 10, the exists there, too. Both PC are running 64 bit Win 7.
I tested from Win 7-x86 Virtual Machine PC with IE 8, it did NOT have the problem. I'm upgrading it to IE 10 and will test again.