Hi. I haven't installed any new software, changed nothing except imported some photos in iPhoto and some tunes in iTunes. Suddenly my MacBook Pro running OSX could not connect to internet anymore. It forgot all of the settings i specified: wi-fi networks, ethernet settings, vpn connections and its settings. Everything that I had under two specified 'locations'. The top menu 'locations' I mean. How did that happen and why? I had to manually set up everything again.