Loop not allowing infinite scroll after post per page limit

Question

Im using masonry with infinite scroll to display posts in a loop. I set the post per page which works great on the index page but when I place that same loop on a single page or a buddypress profile page then it only displays the first set of post per page and when I scroll down it returns no more posts to show. Heres the loop minus the guts.

<div id="boxes">
<?php
 query_posts("cat=-1&r_sortby=highest_rated&posts_per_page=8paged=".get_query_var('paged'));
   if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
   <ul>
     <li>
     </li>
    </ul>
    <?php endwhile; ?>
  <?php endif; ?>
</div>
<div class="infinitescroll">
<?php next_posts_link( __( 'Load more posts', 'imbalance2' ) ); ?>
</div>

<script type="text/javascript">
 // Infinite Scroll
 var href = 'first';
 $(document).ready(function() {
$('#boxes').infinitescroll({
    navSelector : '.infinitescroll',
    nextSelector : '.infinitescroll a',
    itemSelector : '#boxes .box',
    loadingImg : '<?php echo get_bloginfo('stylesheet_directory') ?>/images/loading.gif',
    loadingText : 'Loading...',
    donetext : 'No more pages to load.',
    debug : false
}, function(arrayOfNewElems) {
    $('#boxes').masonry('appended', $(arrayOfNewElems));
    if (href != $('.infinitescroll a').attr('href'))
    {
        href = $('.infinitescroll a').attr('href');
    }
});
 });
</script>

Any idea why it's behaving differently on non index pages?

Answer 1

Okay I've found the solution infinite scroll not working on certain pages. It seems that it is set by default to not load on any Page or Single. You can edit the plugin easily to remove the checks but be aware that upgrading the plugin in future will override the changes and you'll need to repeat them (unless they add a menu option to remove the need for the hack).

http://wordpress.org/support/topic/loading-infinite-scroll-in-a-custom-header-for-a-page?replies=4

I removed is_page() from the following code and now it works:

if(is_page() || is_single() || !have_posts())
        $load_infinite_scroll = false;

Answer 2

Add posts_per_page=-1 to your query_posts().

This will query all posts and be limited to the global stting.