Since the server updated to 1.7.9, there is a bug where clients connecting using version 1.7.5 or earlier will not be able to see player heads properly. To fix it, simply update your client to 1.7.9
Since the server updated to 1.7.9, there is a bug where clients connecting using version 1.7.5 or earlier will not be able to see player heads properly. To fix it, simply update your client to 1.7.9