Oh. I had this problem long time befor, too. And I hadn't a board to ask it. I thaught weeks after weeks. Then I found a game on Blitzcoder with source which used Black smoke. I haven't understand why it's black because I had the same commands only with Loadsprite(). Then I copyed it and It worked. Then I had the Idea with LoadTexture() aand It worked fine.
I think this and the permanent Alpha Level of Sprites are bugs. I don't see any sence in that :-)
I think this and the permanent Alpha Level of Sprites are bugs. I don't see any sence in that :-)