I just wrote an answer to a question about Japan, but it's rejecting all my attempts to enter any kanji (Chinese characters used in Japan) like this guy with this error message:

"Body cannot contain 'X'" popup message

Hiragana (すし) and full-width numbers (01) appear to be OK. What's going on?

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    Let's see if they work in a comment… oh, they don't either! i.imgur.com/UpDNx46.png – o0'. Aug 13 '15 at 15:11
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    I get a 500 Internal Server Error in the console when I try to post any CJK ideographs (I don't think it makes any distinction as to whether it's hanza, kanji, or hanja, so it's not limited to Japanese; the code points are the same for Korean and Chinese). – choster Aug 13 '15 at 16:14
  • Based on this post on meta.se, looks like we should now be on the allowed list. Can you test and confirm? – Gagravarr Aug 14 '15 at 14:34
  • 唔該 It looks like TSE is whitelisted from the ban. – choster Aug 14 '15 at 16:59
  • Did you mean "kana", not "katakana"? – Andrew Grimm Aug 31 '15 at 3:02
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    @AndrewGrimm Meant "hiragana", fixed; thanks! – jpatokal Aug 31 '15 at 4:26

A-ha. @jmac says

We were getting a deluge of Chinese-language spam, and it was evolving so we just blocked Chinese characters. At some point in the future we will re-enable Chinese.

Apparently, it means some usernames can't be entered either. @snailboat has found a workaround.

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    Let's hope there's no future deluge of English-language spam. – hippietrail Aug 14 '15 at 9:16
  • They seem to have reenabled Chinese text and now the spam is back. I left a detailed comment at the "A-ha" link above, but basically it's a Chinese service to get fake US college diplomas. – John Zwinck Sep 22 '15 at 1:05

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