I think I've had this problem once. I had temporarily moved my hood from the neighborhoods folder, and when I put it back the game didn't show it. I got it working though, you could try this:
1. Move your hood(s) out of the neighborhood folder (just place them somehwere else)
2. Run the game without your custom hoods, then exit
3. Now place your hoods back in the neigborhood folder
4. And run the game again
Simple as this sounds, this brought my hood back for me, I really hope it works for you as well!