We've a Sharp AR-350N printer (the N stands for network). AFAICT from Sharp, and the dealer from whom we purchased the printer, the driver for this is the same as the one for the AR-280, AR-450 and all those numbered in between. The trailing letter (N in this case) denotes network or not or some other feature. The driver shows all possible permutation of features: Combination of input paper trays, duplex unit, by-pass tray, mail-bin stacker, finisher, etc. The problem I'm having is this: It's not possible to have all features, so I deselect those we don't have, and select those we do, but my iMac does not remember this. When I go back in to check the printer, the original settings - which do not match what I have - are selected again. This means I'm not able to print double-sided, or staple the output. Where does OS X store the local part of the settings, so it knows which features in the PPD it can use? I really appreciate any help you can give with this because it's been 'broken' for quite some time and I keep coming back to it and I'm not able to progress.