screen refresh in 3D

[Rebecca Davis]

Hi. I am just working on my first project so excuse me if I ask a few too many questions at the start. I have a problem that when I either move or change textures in the 3D view, the scene doesn't seem to refresh.... that is, most of the area is washed out. It seems to only involve interior views for some reason. Any idea what is going on? ... And no it is not my system or video card which are more than adequate to do what I am asking. Thanks for any suggestions.