First of all I have liked very much this mod :) But has something causing a lot of problems, simply INVISIBLE ZOMBIES! Some of then just can have seen by a specific point of view. [ For example, if you look the spot from the north you can't see them, but if you go on the opposite side or a further left you can]. The spot that I record now is over the mountain on the Harbor. If you stand on the entrance you can see just 8-10 zombies but when you come inside to get the loot there are like 20 zombies behind you. I stayed there for 2days in a row trying to get some weapons, I died twice but have seen lot of people run to death there! Please look at this ASAP. It's so frustrating to grow up and die without see anything.
Others places there are invisible zombies: On the woods over the mountain over the tunnel. On metropolis.
Please have check on this. And Congratulations, you are working very well!
PS: Sorry my english :c