When the Wallet is not syncing or when you have restored your "wallet.dat" from an old backup in your brand new installation of the Lapo wallet, you need to resync the blockchain files in your computer.
By doing so, you will not loose your funds. Your funds are in the blockchain. Your "wallet.dat" files contains the keys to claim your funds from the blockchain into your Lapo wallet.
1) Open the "Tools" menu.
2) Click on "Wallet Repair"
3) Click "Delete local blockchain Folders"
4) Let the wallet sync.