I am using Ultimate Facebook with Business Directory Plugin (http://businessdirectoryplugin.com/) and Another Classified Ads plugin (http://wordpress.org/extend/plugins/another-wordpress-classifieds-plugin/).
Both plugins give error messages when a user tries to upload a photo to their listing or classified ad. And Ultimate Facebook is the culprit. Both work fine when Facebook plugin is deactivated.
I have put in tickets with the other plugin developers.
Any ideas? It was working fine until Jan 4, 2013.