CKEditor.

The error came from some script in Application.js

lib/parser.rb

@@ -180,7 +180,7 @@ module Parser
         ret << " class='editable'" if part
         ret << " style='border:solid 1px; margin:5px; padding:5px;'>"
         ret << "<div class='edit_link' style='display:none'>" if part
-        ret << " <a href='#{edit_admin_page_part_path(part.id)}'>#{t(:edit)}</a>" if part
+        ret << " <a href='#{edit_admin_page_part_path(part.id)}' class='nav'>#{t(:edit)}</a>" if part
         ret << '</div>' if part
         ret << part.content rescue ''
         ret << tag.expand