Our setup has a Canon USB printer attached to an iMac w/sharing - network is airport extreme with hard line to iMac. Printing from the iMac is fine, Printing from the MacBook gets extra white space (~1") at top of page. It was not always this way. All applications are affected. If the printer is direct connected to the MacBook then printout is normal. The extra space is not shown in preview. I have tried uninstalling the printer etc. If we edit the page setup to have 0" of header then the printout comes out normal with (1") head space. Any ideas ?