Wow, this thread again!

I think I'll just post here some facts I've collected over time about this issue, so people avoid wasting time:
1. The game freezes at random, but it _will_ freeze eventually, on macs with Intel HD Graphics 3000 (NVidia and AMD suffer from other issues but not this very specific freeze)
2. This happens since the first version of CK2 that was able to run on Intel Graphics chipset (earlier versions did not start at all) so it's not related to new DLCs or patches
3. No OS X update until now has solved/improved the situation (some people said it was getting better with 10.8 or 10.9 only to come back to this thread and say: "it's freezing again"... I suspect it's all related to the randomness of the freezes)
3. The bug is not related to overheating
4. Playing in windowed mode as opposed to fullscreen is not useful, your mac will still freeze
5. PI knows about this bug
6. AFAIK they are not working on solving the issue, I can't even find a bug report about this actually...
7. The system requirements on Steam for Mac and Linux versions do not mention Intel Graphics chipset, only NVidia and AMD. Later they did add "1024MB graphics memory required" essentially cutting off every mac with Intel HD 3000. Of course sysreqs are totally inaccurate (game runs ok but a bit slow on Intel HD 3000 under Linux for instance)
So have fun playing CKII but not on your macbook air/pro with an Intel HD 3000 video card!