I'm not on a Mac, but the archive contains a file called genesis.json which contains all addresses and balances in a simple format. You can easily check your balance "manually" by reading this file. You may have balances at automatically generated change addresses, as well as the addresses listed in your "Receive" window, so you may need to use the listaccounts and getaddressesbyaccount commands to figure out all of your addresses.
Is there any chance we can see the code which was used to create genesis.json? The initial balances should be publicly verifiable, i.e. derived from the blockchain with open-source code.