After the part where the large tentacle comes out of the ground (DEAD MAN WALKING) and starts seeding some type of spores/bio warefare crap in the air my scarab ammo was at 40 bullets and once i used up those I could not pick up more ammo for the scarab. I finally got it to work properly after i restarted the game before you sit in the nano chair and played through the helicopter crash scene again. However once I woke up with all of the scavenger looking bugs trying to svck my blood out or whatever I killed some and it said I had picked up nano catalyst but when I went into the screen where you set up your nano perks it was not registering that I had been picking them up. It finally started working once it go to the next major section where a walkway is blown in half across a street and you have to drop down and kill like 10 aliens. Besides that the game looks great will gladly take more customization options but will wait, thanks.