Hello people! Are you able to successfully save your files and properly able to rename them and place them in the proper folder but no graph is being loaded? I might have a solution for you!

I have a feeling that the problem is with custom content needing to be placed in (game)/custom/nameofcontent/(whatever) instead of game/(whatever) in newer versions of the source engine. You could try doing that, but I know that what I did worked and I wont test it because I'm too lazy.

First you want to go to your addons folder and create a new folder there. Name it whatever you want. I used my chairgun folder from the development tutorials. Create a new folder in there and name it maps. Then create another folder in maps called graphs (seem familiar?). Place your .ain file in there, and your nodegraph will properly load, so npcs and zinv will now work!