Hi all, I come to the problem right now. my configuration: one Z1, one F1 and two D2. Computer Mac with 8Gb RAM, 2,5 GHz Intel Core i5 I connected the first D2 to my Mac's USB, the other D2 and the Z1 to the USB Hub of the first D2, the F1 to the Hub of the second D2 ... but the F1 is not working. Same if i connect a pen drive or external HD. I noticed that in the first D2 the leds of USB ports are both green, while the leds of the second D2 USB ports, are both red. In the D2 documentation I found nothing about the management of their USB ports ... did anyone have any experience on this?