Already posted this in The Bar, the person from whom we bought the Default skin hasn't updated their template to support vBulletin 4.2.2, so we're stuck until they do. Hopefully shouldn't be long. Until then, Dtoid Dark is displaying things normally.
Update on this: looks like the people who made our old skin have vanished, so we're not counting on an update. Looking around for some nice looking 4.2.2 compatible themes, in the meantime Jo says she'll try creating a new temp default this Sunday if she has time.