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Special:Contributions (and other pages I'm told) call Database->getLag, which runs a sql command of SHOW PROCESSLIST which is a mysqlism.  I overrode it with a stub in DatabasePostgres.php to make it work:

Index: includes/DatabasePostgres.php
===================================================================
--- includes/DatabasePostgres.php       (revision 22629)
+++ includes/DatabasePostgres.php       (working copy)
@@ -1178,7 +1178,12 @@
                return true;
        }

+       function getLag() {
+               wfDebug( "Function getLag() not written for DatabasePostgres.php yet");
+               return false;
+       }

+
 } // end DatabasePostgres class

 ?>