PizzaGrinder

Truly a masterpiece of a map, action packed for sure. 
Had a small bug though, when I moved south from the big health clinic in the suburbs into the neighbourhood (moving south east) the houses and the zombies would dissapear with only the ground texture visible. Was kinda frighting as the invisible undead would still approach me. Everything was fine as i moved back north though.
Anybody else has had this happen?