Maybe you should try a search and replace script like this one:
https://interconnectit.com/products/search-and-replace-for-wordpress-databases/
With it's help you can change all old IPs to the new one. Because there might be some other relations in your database that you won't find with an standard search and replace.
You just have to put the script in your root, open it in your browser and fill out the form. The database info is filled in automatically. If you press "live run" it will replace everything that matches.
Hope it helps!