Hi, I have been using the ADUSB2Z "USBi" interface to program a board with an ADAU1772 on it. I have a whole box of these board, produced with a pick and place machine. I have been pulling my hair out in that Sigma Studio will not communicate with a vast majority of them, yet some it will. I have checked and there is no difference between the boards. In trying to find the problem, I decided to load Sigma Studio 3.1.2 on, as I had 3.1.1. Suddenly now the blue LED on the USBi doesn't go off when powered off the USB (nothing else attached). I uninstalled and went back to 3.1.1 and the problem persists. This blue LED from previous experience goes out a couple of seconds after the USBi is plugged into the PC. Please assist!