seteffect and the level editor.
 

This has bothered me for the longest time, when you use seteffect in the level editor to change the alpha or whatnot in the level (making it darker/brighter) and you close the level, or move into another level through the actual process of opening up in the editor, the alpha value kept, and you are required to change the alpha value in the new level. I think once you press F4 in the editor, the alpha value should be set back to the default value. Just a thought.

It works this way for most everything you test. A bit of an irritating quirk, but it's not like it can't be dealt with.