Okay, I installed the 6.50.4 update, and now when I try to run the level with a script file attached, I actually get an error message before I see the messed-up 3D engine window view. It says "Malfunction W1508" and "Can't load". It doesn't say what it can't load, though according to the manual supposedly I'm trying to load a saved game or an info file from another game/project, but I don't see how that's possible since I'm using the basic walk-through script file as my level's main script file, unaltered. Can this error mean anything else? Is it indicative of some other error?