Here are the bugs and defects that I could meet: http://imgur.com/a/aSagh

First of all at the middle of the map the FPS falls quite low.

Then here are the visual reports,

Image 1: in the middle of the map we have everything transparent

Image 2: we can pass through this mesh

Image 3: an opaque texture on the crates would be welcome

Image 4: I do not know if this is normal but we have the impression that there is the vacuum below

Then last details, the zombies often go around to catch us instead of taking the shortest way

I would like to thank the creators of this super map,

I would continue to look for errors. Thank you