The bug is related to "overlay scrollbars". Typing "gsettings set com.canonical.desktop.interface scrollbar-mode normal" the bug is gone.
Typing "gsettings reset com.canonical.desktop.interface scrollbar-mode" the bug is back. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1478175 Title: Gtk.AboutDialog credits background becomes trasparent To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1478175/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs