I have upgraded my Kobo's to 4.33.19759.
I previously had an annoying but small problem with the dictionary, I only use the English one
When I searched for a word say
Dictionary, I almost always got a response like this:
"There were no matches for
Dictionary the closest match was
Dictionary."
And then a correct description of the meaning of the word.
Problem gone after update
Books were KEPUB's converted from EPUB using KoboTouchExtended.