Thread:RansomTime/@comment-30671736-20130225002616/@comment-4856057-20130225030905

From the looks of it, the visual editor does not like when you put a heading ( ==Heading== ) on the same line as an image link.

Assuming you're talking about the House of Anubis wiki, The headings "My Third Favorite Characters" and "My Third Favorite Userboxes" need to be moved to the next line in source mode to re-enable visual editing.