I have had my S9 Autoset for about a month and have experimented with different settings (thanks to this forum for how-to). I have found that regardless of what I do to change the SmartStart feature it remains grayed out. Have you other S9 Autoset owners been able to adjust it or is it inoperable in your machine too? If I have a defective machine I have only 23 months remaining to get a new one under warranty.
The smart start will only work with nasal and pillows masks. If you have a fullface mask you can still set the mask type as nasal and the smart start should work. go into the clinical menu under the options tab and turn it on.