This is a problem with my NS. I start it up, looks fine. When i enter any type of server, i get in, and there is just words like Welcome to Natural Selection, Enjoy, and the screen around it is black. I look in the console and this might be the error. Missing bitmap font gfx/vgui/fonts/640_OverwatchScheme.tga . How do i correct this problem? I have tried all the downloads from your selection.

don't remember exactly but I am relatively sure it is either:
1) change your display type (switch D3D/OGL)
2) cl_gamaramp 0 in the console.