I uploaded one site to the new Wordpress 3.3 with no problem, but I am getting a Fatal Error on a second and now I can't login to the wordpress back end (but the site seems to be working fine).
The site is NHLPredictions.org
and this is the error I get when trying to view the wp-admin:
Fatal error: Call to undefined function is_rtl() in /home/content/91/5809591/html/nhlpredictions/wp-includes/general-template.php on line 2102
Does anyone have any idea? Will pay for help.