when you deleted the code block, you also deleted the HTML tag line:
<html xmlns="http://www.w3.org/1999/xhtml"><!-- InstanceBegin template="/Templates/New_template_2010.dwt" codeOutsideHTMLIsLocked="false" -->
that should be added back
i dont see the additional recordset you mention on your page, only the listUsers_i recordset.
to troubleshot the listUsers_i recordset, add the following code in the body to write the SQL to the page:
<?php echo($listUsers_i->debugSQL()); ?>