I think we are using exactly the same mvs converter version (the last one green) .
I tested KOF 2003 AES and i get also a black screen , then tested Samurai shodown V that is working ....i suppose the special should work too.
The difference between fille1976 and me is he get a better (less garbage) menu screen , but he couldn't play a game as i can , his console have a unibios , mine is stock .
PS: KOF 2003 once flashed in neosd work fine on my cab , and i have the original mvs cart that work fine also with my mvs converter