ARE YOU USING CODE BEHIND TO POPULATE THE CUTE EDITOR ? IN THIS CASE, DisableAutoFormatting="true" DOES NOT WORK with version 4.5 .. I LEARNT HARD WAY AFTER SPENDING MANY MANY HOURS IN FUTILE ..
I HAD TO DO A WORK AROUND..
I HAVE ALREADY REPORTED THIS BUG TO ADAM, AND HE BELIEVES ITS FIXED IN VER 5.0
GOOD LUCK !!