Primitives not Subtracting

[Traveler]

I start up the editor, select a cube, subtract it, then...nothing. I see the yellow box in the viewports, select it, but there's just a yellow outline of a cube. Tried deleting the editor.ini, but the problem persists. I can't apply a texture to it either. It's a bunch of yellow lines in vast nothingness. Any ideas?

[Setheran]

If it's a brand new file then it'll be because maps are additive by default rather than subtractive like they used to be, so there's no solid to subtract from.

[Traveler]

Thank you man! Been trying to figure this out for a while and finally broke down and came here. It works now! Thanks again.