I have three HDC1000EVM's from Digi-Key. One works fine. The second fails to communicate via the USB connector. The third has a -40C and 100% humidity reading constantly. I am using a Windows XP desktop with the HDC1000EVM GUI 0.0.1.5 software downloaded from TI.com. When the good unit is plugged back into the same USB connector as the other two, it again works just fine. There seems to be an issue with the EVM module manufacturing....