Thanks everyone for the very kind help -- yes, the "flicker" part was what I was missing!

It's always the stuff that's so obvious the tutorials don't bother mentioning, that trips me up!

Thanks Dave -- I don't even know what a compenent is yet I kind of have an idea but at this point I just need to make something that can be a component.

I don't see how, if I am drawing a rectangle on the floor with a rectangle tool, it can not be parallel. Or, if I pull that rectangle up to make a 3D wall, how the front cannot be parallel to the back. I can't even see a way to make them not parallel.

I have tried verrrrry slowly pushing the "window" back but no matter where I stop, no void.

I don't suppose it would have anything to do with using a Mac, but that's all I can come up with. It's just so simple I can't see any way to not get it right, but that's what I have managed.

Thanks -- I guess I need to find out what "context" means -- what I am doing is drawing an elongated rectangle and pulling it up to make a wall. Then I draw a rectangle on the wall face, and push it out the back. No void, just a box sticking out the back.

I am trying to make a window in a wall. I have even done it in the past!

But when I follow the tutorials and push the "window" out the back I just get a box sticking out the box -- it is extruded but not voided. Any idea why I cannot do this simple thing correctly? It is SO simple I can't even see room for error -- but for me apparently so!

Thanks!