fonts problem in KDE or maybe in all kinds of Desktop environment

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http://forums.fedoraforum.org – I update system today . Just before , everything is normal. Once it finished , I found that my KDE can't display some characters . I am a Chinese user. The English words are normal,. Just some Chinese characters can't be displayed . When I refreshed the browser , they can be displayed again but some of them are font default and some of them are font Yahei. And they are displayed messed together . It is not pretty. AND it is not only in browser , anywhere displayed Chinese characters looks the same as browser. So could someone tell me how to change them back to default font as one font not two types of font messed together? Attached Images snapshot.jpg (90.7 KB) (HowTos)