I just got a new printer: the Epson Artisan 835 (shares software with the 830, which is why it's listed as 830 below). I'm running 10.4.11 on my Macbook Pro. I've tried using the duplex feature with Adobe Reader (9.4.5) with no luck; the option is shaded out. I've played around with the settings, and they are set as instructed, but I haven't been successful. Any suggestions would be much appreciated. I also emailed Epson tech support. Thanks in advance!