The customized theme is based on the famous zen theme.
I layout the site according to my previous blog, Customized page layout according to node type .
The simple layout node type is page, so i create the page-page.tpl.php file, which doesn't include the following statment at the end of the file.
<?php print $closure; ?>Everything is OK but the FCKEditor, which is disappeared sometimes.
Finally i find the reason, add the above statment to the page-page.tpl.php file.
Remember:
$closure is used to include a lot of important code snippets by some modules, such as FCKEditor. Without it, your drupal site will have trouble soon , so include it always!!

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