php 5.3.0

I should mention that this occurs for 6.x and 5.x.

Do you have any idea what that feature is? I'm happy to dig into the code and come up with fix but it would be helpful to get a headstart.

I've pretty much figured out what its going on. In D5, we have the following in class_album.inc

function theme_views_view_album_grid_view($view, $type, $nodes, $teasers = false, $links = true) {
    $term = taxonomy_get_term($view->args[0]);
    drupal_set_breadcrumb(acidfree_make_breadcrumbs($term));
    $offset = _acidfree_get_pager_offset_from_path(ALBUM_PAGER);
    if ($offset) {
        $offset = " - ".t('Page !page', array('!page' => "".($offset+1)));
    }
    drupal_set_title($term->name.$offset);
    if (count($nodes) == 0) {
        return "<p>".t('This album is empty')."</p>";
    }
    $output = "\n<p class=\"acidfree-center\">".check_markup($term->description)."</p>\n";
    $output .= theme('pager', NULL, 1, ALBUM_PAGER);
    $output .= '<div class="clear-block acidfree">' . "\n";
    foreach ($nodes as $node) {
        $node = node_load(array('nid' => $node->nid));
	$function = "acidfree_print_thumb_{$node->type}";
        $output .= theme($function, $node, $term)."\n";
    }
    $output .= "</div>\n";
    return $output;
}

For whatever reason the theme call is not invoking theme_acidfree_print_thumb_acidfree or theme_acidfree_print_thumb_image for example. if I change it so that we invoke it as

$function = "theme_acidfree_print_thumb_{$node->type}";
$output .= $function($node, $term)."\n";

Then the method gets invoked and everything displays like I'd expect. I poked around inside of theme() and it looks like it uses call_user_func_array() to invoke the appropriate function. So I replaced the above code with

$function = "theme_acidfree_print_thumb_{$node->type}";
$output .= call_user_func_array($function, array($node, $term))."\n";

and the function is not invoked. What gives? Why is call_user_func_array behaving differently when running under php 5.3.0?