The pic on the hub is not a player in the pixelnet. It converts pixelnet to dmx. If you have some dmx stuff, you could hook that up to see if pixelnet is getting to the hub.
Set the dmx uni to 1 on the hub and set the dmx device to start at 1. Then transmit something on the first pixelnet channel or use something like the color picker - red = 1, 4, 7..., blue = chan 2, 5, 8... , green = 3, 6, 9...
RM