[davidw]

This is just me, but if I were working on this style, I'd probably use something like this for the header:

<!-- logo -->
<a name="top"></a>
<table border="0" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" align="center">
<tr>
	<td align="center"><a href="$vboptions[forumhome].php$session[sessionurl_q]"><img src="$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" /></a></td>
</tr>
<tr>
	<td align="center">$ad_location[ad_header_logo]</td>
</tr>
</table>
<!-- /logo -->

<!-- content table -->
$spacer_open

$_phpinclude_output

$ad_location[ad_header_end]

And something like this for the navbar

<br />

<!-- breadcrumb, login, pm info -->
<table class="tborder" border="0" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" width="100%" align="center">
<tr>
	<td class="alt1" width="100%">
		<if condition="is_array($navbits)">
			<table cellpadding="0" cellspacing="0" border="0">
			<tr valign="bottom">
				<td><a href="#" onclick="history.back(1); return false;"><img src="$stylevar[imgdir_misc]/navbits_start.gif" alt="$vbphrase[go_back]" border="0" /></a></td>
				<td>&nbsp;</td>
				<td width="100%"><span class="navbar"><a href="$vboptions[forumhome].php$session[sessionurl_q]" accesskey="1">$vboptions[bbtitle]</a></span> $navbits[breadcrumb]</td>
			</tr>

This may not work, but I haven't seen the actual site. This is just something I'd try to fix the shift as I've seen this issue before.