The backspace key frequently just stops working when in chat and when creating signs. The only way to fix this is to completely exit the game and restart it. The MAJOR problem with this is it is happening with greater frequency, to the point that I have to restart two or three times in one gaming session.
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Thanks! I'll give that a try.
Duplicate of MCPE-30205.
Note that many of us have been able to restore the function of the backspace key without exiting the game by holding down the right arrow key or tapping it a few times.