[AndyT]

Hi Mike, 

Well I think this is the problem .... if not it is another one

Steps to reproduce. 
Plug into Genos 2 and set the following:
Midi: Device Genos etc. Library Google  Connection USB 
    Midi Input Ports
        Yamaha Corporation Digital Keyboard[0] (Connected)
        Yamaha Corporation Digital Keyboard[1] (Connected)
    Midi Output Ports
        Yamaha Corporation Digital Keyboard[0] (Connected)
        Yamaha Corporation Digital Keyboard[1] (Connected)
All works correctly
Unplug from Genos and plug into Windows PC (so I an copy a PDF to swap over) 
   Copy the file from the PC to a directory on the SSD
Plug back into the Genos
Not working

To fix the problem
Go back into midi settings
The Midi input and output ports still say the same (connected as above)
Tap each of the midi connections to disconnect and then tap again to reconnect  
Then it works again

Cause (maybe)
When I was using the "Default" library and I plugged in to the Genos it used to ask for permission to connect (or something like that) every time! I think it must have reset the midi connections when you said OK
With the Google library, it doesn't ask and I think that something needs to happen to reset the connections when you plug it into the Genos again. 

Hope this helps

- Andy