I have a UINavigationController controlling a stack of UIViewControllers. When I push a certain UITableViewController onto the stack, I find that the top row of its UITableView is hidden behind the UINavigationBar.
This problem only happens on the iPad, not the iPhone. I am using the same stack on both.
Also it only happens on one of my controller stacks. I push the same UITableViewController subclass on stacks controlled by two other UINavigationControllers, and there is no problem.
One difference in the problem case is that the UITableViewController is pushed from a UIViewController that is displaying the results table generated by a UISearchDisplayController. I don't see why this should matter (and, as I said, on the iPhone it works fine), but maybe it is significant given that a UISearchDisplayController hides the navigation bar when the UISearchBar becomes first responder.
The problem affects both the iPad device and the iPad simulator. I am using a typical UISplitViewController design, with these stacks in the left hand pane. The problem still occurs in the popover when in portrait.