CFS1 video freaks out (?)

I'm not sure how to describe this in words but after about 5-10 minutes of free flight the video display starts doing wierd stuff. In spot view when the plane turns it leaves multiple traces of itself and so does the scenery. I had just downloaded and added several sceneries plus the "blue sky" mod so maybe that is a clue....?
I'm hoping some of you have seen this before and know what the cause is.
Thanx,
Jim
I'm hoping some of you have seen this before and know what the cause is.
Thanx,
Jim