Ok I have SP1 and have been using it for several months, but I'm beginning to see a similar problem. When I say "cleared" the overhead comes up, strobes are turned on, overhead disappears, TA/RA, etc. Occasionally this is all that happens and the landing lights are on and stay on, but most times the overhead will come up a second time, the "click" of the strobes switch happens again and the landing lights come on then off, and I have to turn them on manually. This is the only glitch I've yet found. Any help?