Upgraded to Mavericks last night and after upgrade neither of the two printers I had been using were working, Mavericks couldn't find them. Reset the printers, and found the Photosmart All in one that is on Wifi and now it works. The second printer an HP2015 Laserjet that was shared through windows (Windows XP) can be found (by going through the windows icon and finding through workgroup) and loaded with drivers, but when used Mavericks cannot find it. I've tried resetting all computers, routers etc. with no success. If I plug the HP2015 directly into the Macbook it works fine. It did work fine just before the upgrade, any thoughts on how to get it working again appreciated!