I'm using Sweet Home 3D and Sketchup 8, free version. I downloaded a Kraft Maid cabinet from Trimble, keeping the original oak texture in one instance and painting it with a texture from my collection in another. I added a countertop (Corian texture from Trimble),
sink and faucet (again from Trimble). When I exported the file, all components were pure white. Tried it without sink and faucet, same result. Fixed up a "junk" cabinet, only adding my texture to some parts - the junk file exported just fine. I downloaded the trial version of Sketchup Pro, built some more cabinets and again all white unless it was a model that I did't care whether it turned out okay (in which case it did). Incidentally, I had a similar problem a couple months ago except that the models were turning all pink. I uninstalled Sketchup. then reinstalled it and it seemed okay until now.

Just now I went to another computer and again all is white.