I've set the cabin lights to shift+\ and I've also tried ` but the lights never come on? I've tried different liveries. Virgin, BA and default.Any theories?

Any theories?

Hmm, I have a few theories,1.) If there is something else tied to the keyboard command it will not work. The main and probably obvious thing I can think of is to go into FSX controls and attempt to assign that same command to something to test. If it's already taken you'll see it say to what, then just find that and delete the assignment and it should work.2.) Another possibility is if your saved default is a PMDG aircraft (or other complex addon aircraft) it will get corrupt or not load everything properly. If you do have one saved as default, remove it and set your saved default to something very simple and basic such as the default Cessna.3.) One other thing that may be it (not 100% on this, or even 50% for that matter) is that in the FSX.cfg there is a Max_number_of_lights=8 or something like that (not on my FSX rig to check). If this means what it says it might be that you have too many light in your [Lights] section of the Aircraft.cfg. I don't really think that the cabin lights or dome light work the same way as other lights and think they are just texture changes but again, I'm not 100%.Hope this helps,