remove texture but paint mesh

Hi
I get flickering points depending on sun etc. in x-plane.

http://tinypic.com/view.php?pic=34xp0k8&s=6

Why? How to solve? Remove texture and paint? If I remove the texture
the mesh is transparent. What could i do wrong?

I also have flickering on meshes depending on meshes below that should not be visible.
I’m still on 2.49
Many thanks