Umberto, I think it is unpossible, that it is a problem with other Addon´s. I have do nothing else, only buy KLAX an put in the Serial in FSX (in Addon-Manager). So what will be doen than. There are no changes off any addon´s or so on. And, without the FSD Products my FSX works with all other addon´s well. So I think, it´s your problem. And when you see in the forum, that I am not allone, it may be a problem off FSD.
Roland