That is, I believe, the only person who's reported such a problem, compared to the many people (including myself) who've found significant improvements as a result of the upgrade - the dictionary look up is a lot faster now - the navigation button response has been much improved. Several known bugs have been fixed (eg issues with large cover images on books, and problems with some dictionaries not finding words have been sorted).
What have you got to lose by upgrading? You can always reflash with firmware 538 if you don't like it.
By the way, for the first few months of its life, the Sony was very buggy indeed - it was only really after the 2nd firmware upgrade that things stabilized.
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