Droplet created from a snapshot not working

You should contact the Support, they are fast and verry helpfull!

It’s not entirely clear from your question, but when you say that you SSH into the server and it still shows your old IP address, do you just mean in this message:

Thank you for using DigitalOcean's Django Application. 
We have created a default Django application that can be seen from http://xxx.xxx.xx.xxx/ 
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You can use the following SFTP credentials to upload your files (using FileZilla/WinSCP/Rsync): 
Host: xxx.xxx.xx.xxx
User: django

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Nginx listens on public IP (xxx.xxx.xx.xxx) port 80 and forwards requests to Gunicorn on port 9000 
Nginx access log is in /var/log/nginx/access.log and error log is in /var/log/nginx/error.log 
Gunicorn is started using an Upstart script located at /etc/init/gunicorn.conf 
To restart your Django project, run : sudo service gunicorn restart

If so, that should be a problem. That file is created when you launch a new Django “one-click application.” That is just your initial information. If you create a snapshot, that file is not updated. There is no way for it to know the new IP.

You problem is going to lay somewhere else most likely. Are you seeing any errors in /var/log/nginx/error.log ?