Session match IP or User Agent in IE 9 kills!

[eluser]RJ[/eluser]

Code:

$config['sess_match_ip']    = FALSE;
$config['sess_match_useragent']    = FALSE;

If either of the above are set and the user is in IE9 sessions blow up on refresh (either page refresh by user or by redirect('', 'refresh')).

The session table name, cookie and csrf cookie and token have all been renamed to "mysess" removing non-IE friendly characters.

Any thoughts?

Thank you.