Updating Enfold file via ftp manually solved the problem. I wish I don’t have to deal with the same issue whenever I install plug-ins.
Thanks for your help!
Thanks for your respond. I think it happened after I activated a plug in. You can check my website at http://www.yonglee.net. The sorted menu (on categories ) has been disappeared. All I see is “all” button. is there any way I can update the theme file without loosing any setting and data I have already?