Thanks for the link sjshipper.

If the Mac folks want to try the equivalent of "resetting the computer", just go to System Preferences->Accounts and create a new Admin user http://docs.info.apple.com/article.h.../en/mh168.html This allows you to test without touching your existing settings.

Check the "Allow User to administer this computer" in the password tab to make the new account an Admin account.

Log into the new account, run LW from there, and see if that makes a difference. If it does, then the problem rests in the settings in your usual account. If the problem continues, at least you know that to look outside your Mac for the solution.

(you can always delete the new account from the System Preferences, and your Mac will be back to its usual state)