Simple nRF24L01+ 2.4GHz transceiver demo

I have also set-up two nRF's with two Uno's and am trying get the simpleTx and simpleRx one way communication working; it's not working.

I'm using this library:

I've followed Robin2's instructions, added the 10uf capacitor for stabilizing power, and my nRF modules look like the ones in his picture.

Still no luck; i get this on the sender:

SimpleTx Starting
Data Sent Message 0 Tx failed
Data Sent Message 0 Tx failed
Data Sent Message 0 Tx failed
Data Sent Message 0 Tx failed
...

And this on the receiver:

SimpleRx Starting
Data received Message 0
Data received Message 0
Data received Message 0
Data received Message 0

No errors other wise. Has anyone successfully gotten "Simple one way transmission" working with Robin2's provided SimpleTx and SimpleRx code?

Ali