Problem confirmed as still being in 6.3.
(I thought so when I did not see it in the whatsnew.txt)

Typing using any cjk(chinese/japanese/korean) input method does not let the accentuated chars(é/è/à etc) go through, but converts to their unaccentuated counterparts(e/e/a etc).
The problem does not appear in almost all other applications I tried(internet explorer, firefox, skype, google talk, photoshop, notepad, etc).(I had the same problem in skype though)