Hi Subwolf, thanks for the reply. It seems that this problem has to do with which part of a simulation you are playing.On some the lights stay on on others they do not after a save. When you click on the Navigation lights they do not stay on especially on tugs. Also the buoys lights do not come on at night of course. Looks like it depends on who did the initial programming of the segment. It is not a big deal just something I noticed. Regards Peter