fsx view issue

I dont know what happened but i now have no view to outside on one of my stock fsx microsoft aircraft. The 2d view has a view outside, but the 3d view is completely black to the outside, there are no problems with the panels.Like i say it only happens on 1 aircraft and actually i dont fly that plane that often. I think the issue is in the main aircraft file for that plane because it recurrs on all versions of that aircraft.Can someone assist?Peter