I'm having the same issues, are you running Dc or DCC. I've took out the decoder and put back the blanking plug and the lights work just fine on DC, when I put the decoder back in, back to square one, the front lights work but rear ones don't. The F1 button shows that the red lights work but do only work when its pressed, goes out then button release. I'm using a Hattons 21 pin decoder and the unit works lovely on the track, very smooth running, just this niggly issue with the lights. Someone mentioned using a ECU decoder however I'm determined to get the lights working on the hattons decoder, surely the function buttons work the same on most decoders. PS its the same issue with a Bachmann 21 pin decoder also so something amiss somewhere.