LOL!
Adrian tested the wallet on several OS versions, so not sure what has happened.
I'll send him an email now so he can look into it.
Why my GBcoin address is square?? LOL
I'm Korean.
I think this situation seems to be the cause of the problem is the font.
And I don't speak english well. sorry~
If it's a corrupted wallet and you haven't sent or recieved any coins then do this:
Close the GBCoin-Qt app and delete or move the ~/Library/Application\ Support/GBCoin/wallet.dat file then reopen and it will create a new one. Command line option below, open Terminal and paste that then press enter that will move the possible bad file to your desktop then you can reopen the App.
mv ~/Library/Application\ Support/GBCoin/wallet.dat ~/Desktop/