The site is using version 1.6.8, and there is PHP in that particular template.
Come to think of it, I think that may be when the problem started to occur.
Basically, I am using a single template for all of the blog content, and then serving up different markup depending on the segment variable. The problem was pagination. There did not seem to be a way to test a segment variable with pagination (P1, P2, etc), so I pieced together this script that does so (see below).
Is there a smarter way to handle that conditional logic?
the code is:
<?php
global $IN;
$seg2 = $IN->SEGS[2];
if ($seg2=='' || substr($seg2,0,1)=='P') :
?>
<body class="listing">
<?php
else :
?>
<body>
<?php
endif;
?>
Thanks for the help!