iOS redesign needs a \"back\" button!

Just got the redesigned iOS app this morning, and there is one serious interface issue.

When I am in the lesson screen, I can press \"Vocabulary,\" for instance, to show the vocabulary; then I can press the \"back\" button to go back to the main lesson screen.

However...when I press play, there is no \"back\" button in the audio player. (There used to be!) This means that I can't, for instance, start the dialogue-only file playing, then go back to the \"Dialogue\" tab to follow along with the dialogue. In fact, I can't get back to the lesson at all! I have to click the menu, click \"Saved Lessons,\" scroll down to the lesson in the \"Saved Lessons\" folder, click \"study\" in the popup, and then click \"dialogue\"--by which time the dialogue is over.

Please give us our \"back\" button back!