Graphics Card Issue?

Hey. So, I think I'm currently dealing with a graphics card issue while working on Hegira - for some reason, sometimes the game world will turn invisible while using the BGE.
I know it's not just the BGE, as it happens with other scenes, as well, and usually, restarting the BGE fixes it. I know that I don't have the best graphics card ever, so I think that I might have to keep shuffling around different card driver versions to try to catch a good version. Anyway, development's pushing onward!

I finished a quick mesh of the game developer's greatest friend and scapegoat - the crate! And yes, it's the same texture as the door! Yeaay.