Alan Wake v1.05 release notes:

• Fixed crashes with Alt-Tab in SLI configurations.
• Fixed saving of assigned keys so that both Numlock on/off states work and can be defined separately.
• Fixed command line handling so that invalid input does not cause the game to enter unresponsive (“No World Loaded”) state.
• Added better error messages to File IO operations to track down some problems.
• Please see our forum for up to date troubleshooting and update information: http://forum.alanwake.com/showthread.php?t=7759