When RWW webmaster Jared Smith sent me screenshots of yet another change to Google's top navigation bar, I thought it was a bug. Then I got it, too. It's a weird hybrid of the old, black nav bar with plain, gray text and the new, light one with the icons and Google search box. Sure enough, just now, Google announced the change, so it will be rolling out to all users soon. The black bar, sometimes called the "sandbar," only appeared in the middle of last year as Google began to redesign its interfaces, and the gray Google Bar was launched in November. Some users still have the sandbar, and…