I just installed 10.8.5 first on my remote MacPro where my music files are and which feeds my MacMini with MC 18.0.218 installed. After installation and initial restart on the remote Mac, MC would crash after completion of a song. However, when I rebooted the remote Mac a second time the problem went away. I have now installed 10.8.5 on the MacMini and restarted it twice and everything works. So my tip is to restart your Mac a second time after installing 10.8.5.