This is strange. I can see the cube fine in MED, but I can't see it in my level. It appears to load fine and there is an entity in the level with that filename and it's not invisible and it's scaled correctly and all that, but I can't see it. Just to make sure I created a very simple level in WED and loaded it there. Again I can see the level geometry but not the block. And I can see it in WED! Just not in the running level. Weird, huh?