Making my first map, and the zombies in the map spawn, but do not leave their place. I only have the path nodes from the zombie spawners to the barriers and a few inside the map as of right now for testing purposes. What am I doing wrong? Here is a link to a screenshot of Radiant on Imgur - http://imgur.com/a/kGhSc

the purple path node is clearly inside & touching the white prefab square, seperate plz they dont like eachother

Thanks for your response. I fixed that, and have tried arranging the path nodes in various ways, but nothing seems to work. It seems as though a lot of new mappers have this same problem where their zombies spawn in, but do not go anywhere even though there are path nodes.

On your picture I can see 2 problems. I hope this will help you. 1) Your paths are very close to each other. I see that you have path on every square ( 2D grid radiant ). Make sure between paths are two squares, so one square space. 2) Zombie windows have already paths, so you don't have to add paths right next to windows and make sure your paths don't touch each other. 

Does this look right? http://imgur.com/a/2KfVj If so, it still isn't working. The path nodes are two squares away from each other, the zombie spawners, and the barriers. The reason I have the zombie spawners facing away from the building is because I want the zombies to walk around a wall that I will make between the zombie spawners and the barriers.

Make sure your spawners are aligned to the ground. They are floating 

Before you launch your map open up the console and type:

developer 1

Then launch your map:

devmap nazi_zombie_yourmapname

And ingame type in the console:

ai_shownodes 1

This will show your pathnodes ingame so you can see if they are correct connected to eachother.

Does this look right? http://imgur.com/a/2KfVj If so, it still isn't working. The path nodes are two squares away from each other, the zombie spawners, and the barriers. The reason I have the zombie spawners facing away from the building is because I want the zombies to walk around a wall that I will make between the zombie spawners and the barriers.

yes your paths are correct now, but I can see the zombies are to high from the ground. Maybe that's the problem or problem could be zone. If your zone is set up incorrect than this is the problem. Also it may be zombie windows or zombies that have incorrect KVP.