The latest patch addresses the encrypted storage issue.
Do you see exactly this dialog about media? I verified the code and the fix is definitely in the latest update.
Can you run hdiutil command mentioned before?
You can't run DRM protected executable outside of steam on OS X. Game will crash no matter what.
Please close steam and start it again and then run the version which is outside of users. It should run most certainly. Steam is notorious for hanging start window, you can login/log off to cure this thing mostly or restart like I said
I will be waiting for your hdiutil btw
