in the galleries/global.php file, change line 14:
$_SERVER['DOCUMENT_ROOT'] = str_replace( '\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['ORIG_PATH_TRANSLATED']), 0, 0 - strlen($_SERVER['PHP_SELF'])));
to:
$_SERVER['DOCUMENT_ROOT'] = str_replace( '\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['PATH_TRANSLATED']), 0, 0 - strlen($_SERVER['PHP_SELF'])));