I think there is a button on the left side bottom that toggles if walls are viewable. I think they always show up in build mode though (?)
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Do any walls of anything show up? If not then it sounds like it's a GPU Driver issue.
Update GPU Drivers.
If it's nVidia Reset 3D Properties from nVidia Control Panel.
If it's AMD reset 3D Properties from Catastly Control Center.
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Else post DXDiag
Start -> type: DXDiag -> Save Information www.hastebin.com/
More detailed description = http://answers.ea.com/t5/Titanfall/PC-Graphic-performance-issues-in-Titanfall-here-s-how-to-help-us/m-p/2454360#U2454360
