It looks like there might be a split in the chain.  If your wallet is not syncing please make sure you save your jimcoinwallet.wallet file somewhere safe and delete your jimcoin folder in the windows appdata folder for windows, and if on linux delete the .JimCoin folder that should be located as your users root directory.  Once deleted open your wallet again and let it sync from scratch.  WARNING: if you delete your wallet file, your Jims will be gone forever so back it up!