A bit of a mystery.
I have a UITabBar with 4 items. Item 1, 2 and 4 work as intended. The third item somehow does not respond to touches, ie "- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item" does not fire when tapping it.
All four items in IB have the Enabled flag set to YES. User interaction is enabled for the tab bar itself.
Any ideas?