So i did a little bit of research and it might be indeed a programming issue. I won't go into details, because I don't understand them. I will mention it in our discussion forum, so the mac guys can have a look at it.
Given that you are the only one reporting this issue at the moment, you might want to try updating your OSX (10.7 is from 2011). If you don't want do do this, i can still extract the gameclock code for you.