The theme on the screenshot is Ambiance; it does not happen in a guest session.
Here it is my .xsession-errors generated after the issue. ** Attachment added: "xsession-errors" https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/976894/+attachment/3094673/+files/xsession-errors -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/976894 Title: Dialogs and windows become black on login To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/976894/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
