hi Pete, I'm sorry you're having issues 😥
That definitely looks like a rendering issue with one of the shaders. Can you send me an email @ taylorswietanski@gmail.com with your graphics hardware & software information, and a more detailed description of where the black plane shows up?
To be honest, it might be a hardware limitation regarding which shader models your machine supports, but you could try updating OpenGL to the latest version and see if that help?
Either way I'd be happy to look into this for you once I get your machine specs ☺️