Hi, the problem is here, we have two fb3-QS boxes with the lastest quickshow software. Quickshow regonised the second box, we see the serial number displayed in the software, when we send a signal for one of the two lasers one box and laser works fine, second box and laser will not show up and flashes yellow. If we disconnect one of two boxes, both laser shows up and when we switched over to the other box both laser works too, even we switched both usb cables to see of there is a problem. We re-installed de drivers from the newest software and also no solution. For now we are using Vista laptop. So, hopely someone here knows the answer.