Forum:How the editor loss visual mode

Hi all, I'm just join here so there are many things still need to learn. I don't know why on our wiki, when edit a page, it only show the editor in source mode, there is no visual mode. (When I edit in other wiki, it's still normal). Is that relate to a template of our wiki? How can I fix it? Thanks in advance
 * Too much templates and codes and/or adding  will suppress the RTE/visual editor. :)  09:35, August 31, 2011 (UTC)