I have a similar problem after updating WP from 3.1.3 to 3.2.1 and then updating Fluency Admin. Plugin reactivation/reinstallation didn’t help.
I merged WordPress with my homepage and checked whether it validates XHTML 1.0 Strict and the only thing that didn’t were the script tags inserted by iG:Syntax Hiliter. To fix it remove language="javascript" from syntax_hilite.php (3 occurences, two have escaped quotes).
