Well according to sigmax's posts on the link below it has something to do with your graphics card...some setting or something, that's to fix the bar.
NeonDS 0.1.1 Released!
The black is either because you have not clicked the run button or the game is simply not supported.
Take a look at the wiki site for tested games and reported statuses.
Main Page - NeonDS
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Get it right fools! The glass is HALF-EMPTY, not half-full!!!
!!! WARNING: Emulation requires a brain !!! WARNING: Emulation =/= Piracy !!!
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