Hi I tried to find some information about the BigFont extension. This is from the X man page:
XF86BIGFONT_DISABLE Setting this variable to a non-empty value disables the XFree86-Bigfont extension. This extension is a mechanism to reduce the memory consumption of big fonts by use of shared mem- ory. So I tried the following. I enabled the cygserver service again and set XF86BIGFONT_DISABLE=1 in my environment before starting up XWin. And voila, xfontsel and uxterm are working properly. So there's definitely a problem with the shared memory support of cygserver related to the BigFont extension. BTW I see the problem also with my mule enabled XEmacs when opening mails under Gnus with Japanese characters. XEmacs crashes happily, but not when using XF86BIGFONT_DISABLE or when disabling cygserver. Ciao Volker