This fix didn’t work for me, but I did run into what caused the issue with the “s_initialized” error. The wifi that I was linked to when I encountered this error limits the ping for anyone downloading or online gaming on the network. As soon as I switched to another network it booted up and let me log in just fine.
It was also on a 2012 macbook pro/Lion 10.8.2.
So just some info to combat the problem. :]
-Danyeru