I searched and didn't see any posts regarding this specific problem with the usb dock, so I figured I'd ask before contacting Sigma directly. After installing the Sigma software I get to the screen where it says to: 1) connect dock to lens 2) cord to dock and 3) usb to computer.
The program then recognizes the dock, but won't recognize the Sigma 35mm Art lens attached. The dock is firmly attached to the lens and I tried uninstalling/reinstalling the software with no luck. I do have a logitech mouse/keyboard that uses a wirelesss usb dongle and I have read that may cause some issues.
I'm going to borrow my neighbors laptop tonight to see if the problems are just software based on my desktop. But any help would be greatly appreciated as I would love to fine tune this lens.