xman cannot display manpage

[WU, ALEX (SBCSI)]

My system is Win2000, running cygwin 1.3.18.

I could start xman to display the first manpage, but it failed to
display the next manpage. 

The symptom is:
error message displayed in concole: 
cannot create /tmp/xman002444: permission denied

xman displays "PleaseStandby" dialog with the following warning message in 
the xman main window:
Something went wrong trying to run the command: cd /usr/man; tbl ... | neqn
| nroff -man > /tmp/xman002444 2> /dev/null

I checked strace output, it seemed that it did access
c:\cygwin\tmp\xman002444, 
I have correct permission for /tmp:
drwxrwxrwt+  23 admin    adminstr    28672 Feb  7 16:40 /tmp

Does anyone experience the same problem w/ xman?

Thanks in advance,
-Alex