Merlins51

I loaded into the aircraft at night and attempted to turn on the cabin lights, but with no success, with the cabin remaining too dark to find any of the switches. The panel lighting worked and I could adjust them with the rheostat, but I was unable to illuminate the cabin using either the cabin or access switch. I tried both with and without engine running. Is this a known issue or is there an internal X-Plane setting that I need to either turn on or off? Would appreciate any help.