Puttygen 64 bit

First time trying to get a secure vps server going and really like Scaleways use of SSH. I am however having some trouble adding my public key to the web interface after creating a server.

I am using the latest version of puttygen (64-bit Release 0.68) to generate my public/private key. I have "SSH-2 RSA key" selected from the key dropdown, along the bottom i've selected "RSA" and left it at the default 2048. The only key that it would accept was a "SSH-1 (RSA)" key but the connection would not complete as it was not a ssh-2 key. I have tried generating several keys, of different lengths, with and without a passphrase.