lol, just figured it out...
I'd added this to main.cpp for the avi recording...
It's from an older FBA.
int AppError(char *szText, int bWarning)
{
SplashDestroy(1);
AudSoundStop();
// MessageBox(hScrnWnd, szText, (bWarning ? APP_TITLE " Warning" : APP_TITLE " Error"), MB_OK | (bWarning ? MB_ICONWARNING : MB_ICONERROR) | MB_SETFOREGROUND);
AudSoundPlay();
return 0;
}