I've tested some more and tried the SNES emulator, worked like a charm ?!
All the other appz I had tried where not emulators. PS2Menu, HDloader, HDadvance, CogSwapper, LaunchElf and so on... All of them would just fade to black and stay there. So I'm thinking they "fixed it" in this version (3.30). As they say on there site and the box, this allows to play Retro Games, maybe they made sure THATS ALL you can do..