I had this problem and saw all the posts here and other places. I now see what the problem was "dislexia". I was pressing the wrong sequence of buttons. Once the correct sequence of buttons is used:
reset, left arrow, right arrow, enter - it works..
what I found was, I was pressing
reset, right arrow, left arrow, enter.. and it was resetting the message just fine, but it wasnt resetting the counter.. in fact many key sequences would have reset the message...
so please make sure you dont mix up the sequence of buttons!!