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digitalmars.D.learn - Access violation after calling ShowWindow

After porting one of NeHe's OpenGL lessons  
(http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=01) to D, I'm  
getting some weird behavior.
First, each and all of these lines give me an access violation:

	ShowWindow(hWnd, SW_SHOW); // gives no error if I instead use SW_SHOWNA

Next, though I've gotten a proper drawing and rendering context, and all  
OpenGL functions now seem to point in the right directions (I get no  
errors calling them), my window refuses to update, so it just copies  
whatever is underneath, and never draws anything over it.

Any help available?

Sep 22 2008