I have made this piece of a building of some kind. I exported it to VRML97, and went to import it into the SWBF2 viewer. When I drag and drop the file it says "An exception of class OutOfBounds was not handled. The application must shut down." I thought I did everything right. The normals are correct, I have texface on, and I also tried unwrapping it and saving the UV in the same folder as my model. I still don't have anything.

I used to get that ALOT. Do you have the latest version of blender and the vrml exporter script? When i updated to the latest blender version it worked fine. It also might have something to do with python, as that handles all the export scripts, so make sure thats the right version as well.

I'm using 2.49 but I should try to just export in 2.5. I do have the right Python.

It just dislikes something about the shape of that particular model, that's about all I can tell you. Check for places in the model where one face is a normal facing one direction, and attached to it is a face with a normal facing the opposite direction. This might cause problems. I know if I were a 3D program I'd be confused by it...