Are you running as root?

I had a heck of a time getting nano fury's to work with bfgminer without being root.

I had to create

pi@pi2 /etc/udev/rules.d $ cat 77-hidraw.rules
ATTRS{idVendor}=="04d8", ATTRS{idProduct}=="00de", SUBSYSTEM=="hidraw", ACTION=="add", MODE="0666", GROUP="plugdev"

To let my miner user get at the device.