After applying the workaround, logout/login this issue disappear. I don't know if it can be related, but after that workaround I'm unable to reproduce the nautilus crash in bug 718098 anymore.
** Changed in: gdk-pixbuf (Ubuntu) Status: Confirmed => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/719861 Title: After installation icon theme default to gnome-icon-theme and cannot be changed -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs