Index: /tags/ipp-20120626/PS-IPP-PStamp/lib/PS/IPP/PStamp/Job.pm
===================================================================
--- /tags/ipp-20120626/PS-IPP-PStamp/lib/PS/IPP/PStamp/Job.pm	(revision 34227)
+++ /tags/ipp-20120626/PS-IPP-PStamp/lib/PS/IPP/PStamp/Job.pm	(revision 34228)
@@ -343,5 +343,7 @@
         $command .= " -tess_id $tess_id -skycell_id $skycell_id";
         # remove duplicate runs for the same exposure.
-        $filter_runs = 1;
+	if ($stage ne 'stack') {
+    	    $filter_runs = 1;
+	}
     } else {
         # this should be caught by caller