This indicates that there's something wrong with your client as your account still holds your balance.
Download the latest NXT NRS version 1.2.5, fire it up, let it download the blockchain and log in to your account. You'll find your 5600 NXT sitting in your account.
https://nxtforum.org/nrs-releases/nrs-v1-2-5-4412/
It's working now. Although, I used this client: http://nxtra.org/nxt-wallet/ much more visual
Thank you.
No problem! The "Nxt Wallet" you're using now is actually the same client as posted above but wrapped into a standalone application by wesleyh. It's great indeed.
All the best