I upgraded to 3.4.2 and (foolishly, I now realize) checked the boxes to accept the theme upgrades as well. The site I inherited responsibility for has a child theme so I assumed all the customizations were in there. But updating the themes messed with the site design. I immediately restored from the complete cpanel backup I had made prior to the upgrade but that did not fix the problem. I am still learning WordPress so advice given as though speaking to a novice would be greatly appreciated.