Something has broken in the category (I think) code, although
mule-category.el and japanese.el haven't changed since 20.4.
The functions `japanese-hiragana-region' and
`japanese-katakana-region' no longer work (they worked in 20.4). I've
traced it down to the following:
(string-match "\\cH" "と")
returns nil in XEmacs 21 and 0 in XEmacs 20.4.
Similarly for
(string-match "\\cK" "ト")
This is bad.
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I protest the NATO war in Yugoslavia.