I hear it generating proper sound of the airplane while running, but there's no airplane 3D-model or anything displayed, just a gray area?

Anyone knows what might be the cause of this?

Edit: Although I'm not too sure whether this belongs in this forum(as it concerns UniPCemu only afaik) instead of the Dosbox forum(where they might know more about this certain game).

I know it's doing something, since I hear the airplane engine on the soundblaster output(it's configured for soundblaster afaik). As well as the video playing with different messages about the environment etc.