In case you just upgraded to WordPress 3.3 and having problems, this would be the first place to look for a solution:
Troubleshooting WordPress 3.3 – Master List
http://wordpress.org/support/topic/troubleshooting-wordpress-33-master-list
In case you just upgraded to WordPress 3.3 and having problems, this would be the first place to look for a solution:
Troubleshooting WordPress 3.3 – Master List
http://wordpress.org/support/topic/troubleshooting-wordpress-33-master-list