[DS]

shadow: The majority of those error messages are actually normal. You'll see them on a Windows or Linux dedicated server too. However, the "Failed to create thread" error along with the crashing certainly is not.

I don't have an L4D2 install in front of me at the moment to confirm what might be happening here, but do you have steamclient.dylib, libtier0_s.dylib, and libvstdlib_s.dylib copied to your bin directory? (This part might not have been too clear). You can copy them from the Steam installation at: /Applications/Steam.app/Contents/MacOS/osx32

Alternatively, you could try adding '-steam' to the command line where it should automatically be able to find those libraries (but Steam would have to running in this case).

Let me know if either these fixes the problem. If not, I'll try to take a deeper look at it when time permits.