Scalable Terrain Model Raster Drape

I am attempting to drape some .sid raster files over a Scalable Terrain Model that I created. I found the Bentley wiki concerning this and followed the steps. My end result is a terrain model that is just entirely shades of gray. The raster images don't seem to be draping properly on the scalable terrain. The scalable terrain was created from an xml file that is good and working. My rasters come in when I attach with raster manager. As soon as I move them over to the scalable terrain, the terrain just goes shades of gray.

Here is an image of my setup.

Any help would be appreciated.

Thanks