hi!
tanzaku gives a tip in the ‘index.php’ template:
line 71:
<?php /* make a new query for grid items (in single page) */
$new_query_arg = 'paged='.$paged;
// use this code if you want filter items by category.
/* $arr_catID = array();
foreach( get_the_category() as $cat) $arr_catID[] = $cat->cat_ID;
if ( count($arr_catID) ) $new_query_arg .= '&cat=' . join(',', $arr_catID);
*/
query_posts($new_query_arg);
?>
change the first line with $ by those between /*
maybe this help, have a try. not tested here ’cause my website’s too new top have multiple articles and pages… tell us more !