I am using the source file that goes with this lesson, and there are a few problems I am running into. First of all, I don't see that scene in the background that shows on the lesson. I didn't think it would affect following along, but when I get to the transparency part nothing looks the same. When I get to the mask transparency settings, it doesn't cut a hole in anything since there is no scene. Most importantly, I am not getting a water affect when following the raytrace settings. I have the following settings: Alpha - 1.33; filter - 0; fall off - 1.00; limit - 0; depth - 0; fresnel - 0; gloss - 1. The preview looks correct, but my gizmo is black where I would expect to see transparency. Is there a step that I could have missed?