You're likely still on the old chain. You'll need to:
1: Save your wallet.dat file in a safe place. (if you don't know how to do this, see #3 below to see how to find your wallet.dat file before you begin the other steps)
2. Download the newest wallet and snapshot files.
3. Reinstall wallet and unzip snapshot file into your roaming folder. (to do this in most Windows systems type: %appdata% in your search box at the lower left side of your screen, select the "appdata" folder and scroll down to find your "Exindex" folder. Now copy and paste your wallet.dat file to replace the new one with your saved wallet.dat
4. When wallet finishes sync click on "Help" at the top of the wallet, then select the "information" tab. This will show you the current block number your wallet is on, compare that number with the explorer. (link on 1st post in thread). If both are same, you're on the right chain.
If you did all this and your coins disappeared, that means they were on the old chain and unless the dev does a swap you've lost them forever and ever.
I hope it works out for you. Good Luck, Chris B.