Missing Textures

Here's a strange one that I have never seen before is FS9 and didn't find after a search...My ground textures have decided to stop loading. It's like they are frozen in place...the airplane continues but no additional textures are loaded. I fly from the usual detail, to less detail, to the base textures usually only seen at the horizon, and ultimately to no textures...just plain white. Clouds, sky and aircraft are normal...only ground textures have the problem.This has only happened twice, but that's two more times than I have seen in 5 years of FS9...Anyone else run into this before?Thank you!