Depends on what settings your elevation is using. If the model display under elevation settings is set to "Surface, Color Fill", you'll need to make sure the fill associated with the surface is set to the correct dimensions. That would be changed here:
If the model display under elevation settings is set to "Surface, Texture Fill", you'll need to make sure the jpg associated with the surface is set to the correct dimensions. That would be changed here:
In both cases, you may want to duplicate the fill or surface before modifying just in case you have used the original elsewhere and it to remain the same at those previous locations.
