N300 Connected but not transmitting information

Hi all, 

Have been trying to figure this out throughout the day. I purchased the Extender and installed it as per instructions. 

All lights are green but the according to a WiFi speed test my connection is at a mere 0.2 mb/s rather than the ~50 mb/s I get through my router directly.

I have tried various sockets at various distances, as well as multiple devices, the good old off-n-on again trick etc. but can't figure out why both the Router and Device lights are a solid green, but the connection is so so poor.

Any advice or suggestions would be much appreciated.

Thanks!