No, I was not even thinking of stating such a thing regarding Linux. However, I would suggest you make a demo to help us understand what issues you are having with the map.
I have seen many strange occurrences of different games, and this one reminds me of an issue I had when I played America's Army, and one of my two video cards died. It was strange that I could see though walls, floors and practically everything, it was all wire mesh and fractions of actual texture. The properties of the game were the same, but looking through everything made the game hard to navigate. I took screenshots, but the the screenshots looked fine. I even took video, but the video also looked fine.
During game however, mostly everything was transparent with wire borders. It was not until a week later I figured out the video card issue.
I am not saying it is your video card, or some installed hack, but whatever your case, hopefully you can get it resolved.