I've not seen this type of error message in my use of the i1 Pro. You don't say whether you installed the Argyll device driver or not. I know that this is required for the i1 Pro to work with Argyll software (I assume the same to be true for this one but could be wrong; for more details on hardware see: http://www.argyllcms.com/doc/Installing_MSWindows.html ) Alan -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Steven Dobbelaere Sent: Wednesday, September 14, 2011 2:05 PM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] I1 Display Pro not working in Argyll v1.3.4? Hi, I'm a new user of Argyll, my first steps... I'm trying to calibrate my monitor with my new I1 display pro. The device is recognized in the i1profiler software but I can't get it working in Argyll. What am I doing wrong? Check this movie to see that the device is recognized by windows and the i1 profiler software: http://screencast.com/t/J3JTsuWSp Here is what I get in Argyll: C:\Argyll_V1.3.4\bin>dispread -v -c 4 -y l f500 Number of patches = 836 Setting up the instrument dispread: Error - icoms - usb_is_usb_portno: port number out of range! C:\Argyll_V1.3.4\bin>dispcal -r dispcal: Error - icoms - usb_is_usb_portno: port number out of range! Monitor: HP LP2475w OS: Windows 7 Home Premium / English THx! Steven