My reading of the documentation is that '-a' only makes the patches longer in the read direction but does not affect the height. Perhaps Graeme can confirm this. Alan -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Philip Reed Sent: Friday, August 12, 2011 4:26 PM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Opening USB port failed (Philip Reed) Hi Juergen, You're absolutely brilliant! I updated the driver and pointed it to the Argyll directy...problem solved! Thank you! Now...any idea how to make the patches a bit bigger? Not sure if I'm implementing the -a switch properly. Regards - Phil Reed -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Juergen Lilien Sent: Friday, August 12, 2011 1:51 PM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Opening USB port failed (Philip Reed) (Appropriate thread subject line added ;-) Hello Philip, have you checked in Device Manager that the Argyll USB Device driver (not the original XRite one) is active for the DTP20? Regards, Juergen