After a upgrade from Ubuntu 12.04 to 14.04 the Orders module stopped working. I
traced it down this route : action.default > encrypted_store::put >
encrypted_store::__make()> cge_encrypt::encrypt

After the upgrade Mcrypt was not set up correctly and therfore this line in
cge_encrypt::encrypt retuned FALSE:
if( !function_exists('mcrypt_module_open') ) return FALSE;

In encrypted_store $tmp is then set to NULL
$tmp = cge_encrypt::encrypt(self::$_enckey,$ser);

This should lead to some kind of error since this is fatal for the rest of the
script.