Problem solved for my case. 
Just to give a hint to anyone who might have a similar problem, I had misconfigured the default pin assignments.
In particular the INCLUSION_MODE_PIN definition was colliding with one of the LED pins (maybe RADIO_RX_LED_PIN).
Hope this helps.
I have the same problem.
When I power on the sensor, the gateway loops forever.
Power up gateway:
0;0;3;0;9;gateway started, id=0, parent=0, distance=0
0;0;3;0;14;Gateway startup complete.
When I power up the sensor, the gateway starts to loop:
0;0;3;0;9;read: 0-0-0 s=0,c=0,t=0,pt=0,l=0,sg=0:
0;0;3;0;9;ver mismatch
0;0;3;0;9;read: 0-0-0 s=0,c=0,t=0,pt=0,l=0,sg=0:
0;0;3;0;9;ver mismatch
0;0;3;0;9;read: 0-0-0 s=0,c=0,t=0,pt=0,l=0,sg=0:
0;0;3;0;9;ver mismatch
0;0;3;0;9;read: 0-0-0 s=0,c=0,t=0,pt=0,l=0,sg=0:
0;0;3;0;9;ver mismatch
0;0;3;0;9;read: 0-0-0 s=0,c=0,t=0,pt=0,l=0,sg=0:
0;0;3;0;9;ver mismatch
Even switching off the sensor, the gateway continues looping forever.
I have exactly the same library version on serial gateway and sensor.
Gateway and sensor did work together in the past, then I switched to eclipse IDE and changed some code on the sensor side.
I am using SOFTSPI.
Any clue?
I will try rebuilding with the Arduino IDE to see if it has any influence 