Have you tried
resetting the device.
Reflashing the device?
Contacting Ckolivas to check if he has a fix?
Or
Nwoolls
I found another thread that talked about changing two USB settings, then disconnecting and reconnecting the devices. They seem to work again.
Now I'm tempted to try the pencil mod.
EDIT:
I was able to reproduce my issue, once again the solution was the same. Unload some USB things manually in terminal and then potential unplug the usb hub or devices and re-plug in. I'm adding details to this thread from another because I'm sure it will help someone...
"Just as a heads up, the only way I was able to get cgminer to see my BlueFury under Mac OS 10.7, 10.8 and 10.9 was to 'unload' the new USB modem
sudo kextunload -b com.apple.driver.AppleUSBCDC
sudo kextunload -b com.apple.driver.AppleUSBCDCACMData
Hopefully this will save someone else a LOT of hair pulling"