Not sure if Mavericks or hardware or both. I have a late 2008 Mac Pro. I upgraded the video card to the ATI HD 5770 (Apple version). When I run Maps if it works fine. However if I scale (change the Window size) the pic becomes distorted (like a video cad error or failure). I must close Maps and reopen and then it works fine again. No problem scaling Google Earth or any other program I have tried.