RH9-Fedora upgrade problem: Chinese, i18n fonts

[John Li]

Please help!
  I have just upgraded from RH9 to Fedora.  However,
I have a problem using Simplified Chinese (Traditional
Chinese works fine).  When at the login prompt I
choose languages, the script next to the simplified
Chinese option does not display Chinese, but little
squares of hex code.  (Thai is the same way.) When I 
choose simplified Chinese and log in, Linux will not 
load, and the following message pops up:
  Your session only lasted 10 seconds....this could
  mean there is some installation problem....
[ellipses represent text deleted by me]

The option is presented to view file ~/.xsession-errors,
which contains:

0mXftFontOpen(): Failed:  
(and then, in Chinese: "file or directory doesn't exist")
Following charsets:
0: -Sony-Fixed-Medium-R-Normal--16-120-100-100-c-80-ISO8859-1
1: -Sony-Fixed-Medium-R-Normal--16-120-100-100-c-80-ISO8859-1
2: -isas-fangsong ti-medium-r-normal--0-0-0-0-c-0-gb2312.1980-0
3: -jis-fixed-medium-r-normal--0-0-0-0-c-0-jisx0208.1983-0
4: -baekmuk-batangbdf-bold-r-normal--0-0-0-0-m-0-ksc5601.1987-0
5: -taipei-fixed-medium-r-normal--0-0-0-0-c-0-big5-0
6: -arabic-newspaper-medium-r-normal--0-0-0-0-p-0-iso10646-1
....
** (gnome-session:5681): WARNING **: Cannot open font file for font
ZYSong 18030 10
** (gnome-session:5681): WARNING **: Cannot open fallback font, nothing
to do

What can I do to fix this problem?

By the way, no such problem existed in my RH9 installation.  I'm aware
that RH9 used zh_CN.gb18030, while Fedora uses zh_CN.UTF-8, I think.
  Thanks very much!