I have just started using blender 2.66a. I was trying to model a chair. I used a cube to create the chair. I exported it as an .obj file. However when I tried to import it back in, it is just showing a cube instead of the chair which I had modeled.
The reason you are seeing the cube instead of the chair is because there is a Cube on layer
1. Your chair is on layer
3. You only had layer
3 visible which is why you did not see the cube even though it is there.
There are two ways to avoid this problem in the future:
Method 1 - deleting the cube
Go to layer 1 by pressing
1on your keyboard
Select the cube and delete it, X
Method 2 - only exporting the needed meshes
Select the chair and any other items you wish to export
In the export dialog check Selection Only
Once you do this you can import the chair and it will work like you expect it to.