Ronstuff - that is precisely what I was looking for. And yes, I am in touch with CL. However, I will need to recreate the lights first and see if I can get them to lock up. Actually I am going to make a new set which uses light 1 3 and 5, then one that uses lights 2 4 and 6 and see if changing from one to the other will set 1 3 and 5 to null lights (instead of replacing them) and if it then crashes. I think it will.... Silke

Silke