On opening logos 4 for on 6 February 2012 I was invited to install an update. When the update was completed I was presented with a signing screen & then with my user profile (e-mail address) and password. Then the error message appeared "logos 4 has stopped working". I ran system restore for 4 February and chose "No" when invited to install update but the same error message appears "logos 4 has stopped working"