After doing accidental categories to tags conversion and revert back, now some of my categories are hidden - cannot be shown in Manage Categories, but there in write new post. I noticed the double slash // before the category's name. Ex: //vidoe Here is the link to my problem: http://wordpress.org/support/topic/181355?replies=5 I will do this for you free too: http://forums.digitalpoint.com/showthread.php?p=7703626#post7703626