By checking the “Mask to default printer” checkbox shown below Tray Selector will try to use your current default printer even if you setup the particular profile button using a different printer. This can be useful if you have a roaming profile and use different printers within a particular office. Please be aware however that the default printer must be able to support the same settings (e.g. same trays ) to the printer you used to setup the original profile. In other words it works best when an office has all the same or similar types of printers. If this is not the case you might experience some unusual behaviour.