So mintpal is closing the market and we have to get our coins out asap, but they are on the wrong fork? Pretty good.
Did you read anything of what's written above?
Griffith & mdtspain updated the wallets, so both windows and mac wallets are on the Mintpal chain...
So please just update your wallet and redownload the blockchain.
After that you can withdraw your coins from Mintpal.
Regards
Goldmaxx