Please note there is currently a small bug in the newly enabled mobile code to save the user options on mobile.
Bug in Message Editor Interface Code in Mobile View
Basically, the Message Editor Interface resets to text when saved in mobile view; even though their is no option in the mobile user cp to change or reset this option.
It's a bug we will need to squash; in the meantime, if this bug happens to a mobile user; you can reset it back in the desktop user CP easily.