Amnesia gets stuck as it tries to open.

[Urkle]

What version of Mac OS X are you using.

Have you restarted your computer (or at least logged out/back in)?

Can run the "Console" application (in Applications - Utilities) and copy/paste anything new that gets added when you try and run the game?

Have you tried reinstalling Steam? Have you tried verifying the local cache for Amnesia? (right-click or control-click on Amnesia, choose properties then Local files, and finally "Verify Integrity of Game Cache"

This looks to be a steam issue. Could you run the demo? did you play the "steam" demo or the separate downloadable demo?