I found that when plugging in the USB device cable (not being able to see the rear of the EX4) you could get the Connector upside down and it would feel that it was connected i.e. all the way home. However the USB Device did not show activity nor was it listed in the Web Interface. After managing to get a better view of the rear of the EX4 i located the USB in the correct Orientation and all sprung into life.
The first effort noted I was sure that the plug was in correctly and located all the way in.
Hope that helps someone
