Black Screen in Stella

[hhcasey]

I'm just starting to setup Launchbox.

On Atari 2600, I'm using the stella_libretro core through retroarch.

When I launch a game, I hear startup sounds from the emulator but the screen goes black.

I've played the games successfully using stella from the decktop.

 

additional info: retroarch 1.9.0  Launchbox 11.9     Stella 6.5.1

any help would be appreciated.