Mednafen Saturn - game will not start with LaunchBox

[gamefan]

Hello - 

I have been using LaunchBox for a while and it's great.  I ran into this problem though, when I try to launch a certain Saturn game (Radiant Silvergun) using LaunchBox (Mednafen core) it gives me this error message - "retroarch.exe has stopped working" but when I bypass Launchbox and start Retroarch.exe and select the game, it works fine.  LaunchBox is using the same retroarch.exe, what could be the cause of this?

[DOS76]

by default I believe RA is set to use the Yabause core for Saturn so unless you manually edited the associated platform in LB it could be trying to load a core that you don't have present