viewunapproved.php in admin
tdheader is wrong.
In the "Send them a page" section change this:
<tr class="tdheader"><td>Approve</td>
<td>Delete</td>
<td width=40%>Subject</td>
<td width=20%>Posted by</td>
<td width=20%>Posted on</td></tr>
to this:
<tr><td class="tdheader">Approve</td>
<td class="tdheader">Delete</td>
<td width=40% class="tdheader">Subject</td>
<td width=20% class="tdheader">Posted by</td>
<td width=20% class="tdheader">Posted on</td></tr>