Newer versions of OS X add new security measures which give scary warning messages for any programs not from the App store. To force your computer to allow you to play Minecraft, disable Gatekeeper entirely by following the instructions at http://support.apple.com/kb/HT5290
It was privacy setting we solved it. Thanks
https://minecraft.net/download
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Retired StaffThis is what the gatekeeper dialog looks like: http://cargo.dcurt.is.s3.amazonaws.com/unsigned.jpg