Web player build crash on new scene load.

I am experiencing a crash that happens whenever the web player build of my project tries to load a new scene.

The unity project works fine in editor, standalone builds, and with web player on Windows. This only seems to happen 100% with web player on Mac OS X. Depending on the browser I get a web player plugin crash error before the machine locks up completely. I have seen this on several different machines. It always locks up the machine entirely and requires a hard reboot.

The only clue I have is checking the Player.log a null exception after several debug lines from the new scene loading up. Again, this happens regardless of what scene I have loading (different objects, scripts, etc..). Can anyone offer any help?

Unity and web player plugin version 4.5.3