May 11 2020. I have the same problem. Have not used for about 3 months, but was working well. I have gone through all the troubleshooting guide as well as reflashed the firmware with 3.0.14. PixyMon is just black. After firmware flash it does say Pixy Detected but also shows a cannot connect message.
I usually connect via a hub, but tried direct to the laptop with same results.