Well it seems that after all this was not linked to the new kernel, rather to Gnome and/or GTK. After an update, everything is back to normal. The following packages were upgraded:
gtk2-engines-pixbuf 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2 libgtk2.0-0 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2 libgtk2.0-bin 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2 libgtk2.0-common 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2 libgtk2.0-doc 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2
Well it seems that after all this was not linked to the new kernel, rather to Gnome and/or GTK.
After an update, everything is back to normal. The following packages were upgraded:
gtk2-engines-pixbuf 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2
libgtk2.0-0 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2
libgtk2.0-bin 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2
libgtk2.0-common 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2
libgtk2.0-doc 2.8.18-0ubuntu1 -> 2.8.18-0ubuntu2