Hi Dan
Thanks for the response.
It happened before I added Immersion. No skeleton at all, just missing aircraft from spot view. Usually leave the screen for about 10 seconds but still does not show.
I'll do what you suggest. I'll remove Immersion and have a play around. Failing that I will follow your instructions about the fsx.cfg and HIGHMEM setting.
Best regards
Gary Watt
Aberdeen, Scotland.