This is the new wallet release after the successful snapshot on the 04.01.2017. In order to use the new GUI successfully, make sure that you delete your local database!!!. The way to do this is by deleting all .iri files in your database folder.

Here is where you can find your database folders:

Windows

C:\Users\Username\AppData\Roaming\IOTA Wallet

macOS

~/.Library/Application Support/IOTA Wallet

Linux

~/.config/IOTA Wallet