I've been banging my head against a wall trying to work out why I just get empty space where the editor should be on one of my sites - it works fine on all the others - and found that if I put the fckeditor folder inside a folder called admin, it doesnt work!
My test PHP file is:
<? include("../fckeditor/fckeditor.php") ; $oFCKeditor = new FCKeditor('FCKeditor1') ; $oFCKeditor->BasePath = "/vtt/admin/fckeditor/" ; $oFCKeditor->Value = 'This is some <strong>sample text</strong>. You are using <a href="<a href="http://www.fckeditor.net/" target="_blank">http://www.fckeditor.net/</a>">FCKeditor</a>.' ; $oFCKeditor->Create() ; ?>