In your head.tpl you need to close the if statement on the customer login:
Here is what you currently have:
Code:
{if $login eq "" } { include file="auth.tpl" }
{else} { include file="authbox.tpl" }
if you add the closing tag on the end like this:
Code:
{if $login eq "" } { include file="auth.tpl" }
{else} { include file="authbox.tpl" }{/if}
That should fix it.