Have you tried printing other images using exactly the same settings as when you print S1 images. Is it a certain colour or all of them? Are you printing with any curves such Roark mono curves for MIS inks? Have you tried printing the S1 images onto a Frontier or something similar you get at a Walmat/K-mart etc?
I have an S2 and print inkjet all the time and have no problems.
Give us some more details and we might be able to help you.
Gareth
www.imagesoflife.co.uk