On IOS emulator Version 6.0 and IOS 6.1.3 on iPhone I created a new page and found that the TinyMCE editor behaves oddly. I see the behavior described in
https://tracker.moodle.org/browse/MDL-36803. In addition, typed text runs past the right side of the editor indefinitely unless you hit the return button. Focus doesn't go to the newline until you start typing again, though that seems like a less significant issue than the infinite width editor. I have also seen this behavior in the TinyMCE editor in various other contexts including forums, labels and quiz essay questions. I tested this on a vanilla 2.5 and 2.4 instance as well as the qa.moodle.net 2.5 instance at http://school.demo.moodle.net/