Game hangs on load screen [mac]

Hi,

I'm having issues with the game, which is a real shame. I get into the menu, everything is fine, then when I load any game (campaign, skirmish etc.) the game enters the load screen, it loads to about 80%, starts making a "dun dun" sound on a loop, and never gets any further. 

I've tried changing the video settings, using the beta instead (1.6.3f1), reinstalling, nothing seems to help. 

I'm using a MacBook Pro running MacOSX 10.8.5 (yes, it's old, and, I would prefer not to upgrade)

2.8 GHz Intel Core i7

16GB 1600 MhZ DDR3

Intel HD Graphics 4000 512 MB

The game is v1.6.4

Here is the log file: Player.log.zip

I've seen similar issues on here, however only for windows machines, and I'm not sure how the fix would work on macs.

Thanks in advance for your time