I've had the same 6 USB sticks running with no problems for the most part. .However this morning one of my sticks refuses to hash. . The green light is solid but the red light doesn't flash or turn on . .the BFG mining GUI doesn't even recognize the stick? And ideas on what happened? They've all been on the same 2 pluggable powered USB hubs. . I remember a while back 1 of the sticks stopped hashing for some unknown reason, but it worked again . .I don't remember what I did to get it working. .Now I'm having the same issue . . .I did a re-start of my computer.  but I'm still stuck.



EDIT: I figured it out! somehow the device manager had the port turned off . . Not sure how it happened . .Strange!