Mac OS X Lion > Disable “Reopen Windows When Logging Back In”
Finally found this one. It's a script which simply does the following:
defaults write com.apple.loginwindow LoginHook /usr/bin/loginfix.sh
The loginfix-script has the following contents:
#!/bin/bash
rm /Users/*/Library/Preferences/ByHost/com.apple.loginwindow.*
To revert back to original behaviour:
sudo defaults delete com.apple.loginwindow LoginHook
