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https://bugzilla.redhat.com/show_bug.cgi?id=475743
--- Comment #41 from Ryo Dairiki ryo-dairiki@users.sourceforge.net 2009-02-20 12:15:40 EDT --- At last, I've found that cjkunifonts-uming package is the cause of this problem in my environment.
It seems like gryphs from that package are chosen in some cases, even in Japanese environments. Japanese period followed by an alphabet is the one example.
After uninstalling that package, the problem goes away. And I've confirmed that reinstalling this package caused the problem again.
I'll send you a detailed report later.