There are quite a few places throughout the skin where the red B button is displayed but it does nothing. You have to press the Back button to go back. In some instances the B button is greyed out so you know you have to use the Back button (can it display the Back button instead??) but other times it is shown as full red so you expect to be able to use it.
It's not a big deal once you are used to it but it would be nice to have it fixed especially for new users.