From systeme/themes.php:
// First try your chosen language
$theme = $conf['theme_dir']."/".$conf['default_theme']."/".$theme_file;
if (!file_exists($theme)) {
// Then try the system wide fallback languae
$theme = $conf['theme_dir']."/".$conf['default_theme']."/".$theme_file;
if (!file_exists($theme)) {
// Then decide whether to die or not
if ($die) {
Shouldnt the $conf['default_theme'] from the first line be something else, like selected_theme?