Tuli, > Emacs and xemacs (as started on Solaris or Linux) experience crashing problems > with the new XFree86-xserv-4.3.0-50. With XFree86-xserv-4.3.0-44 this problem > did not exist. The crashing can easily be reproduced just by clicking on the > emacs windows repeatedly for some seconds, maybe moving the mouse a bit > at the same time.
Let me confirm that you have checked http://x.cygwin.com/docs/faq/cygwin-xfree-faq.html#q-ssh-no-x11forwarding especially "ForwardX11Trusted" parameter. Then, could you show the error message from Emacs (if it prints something on the crash) and /tmp/XWin.log from the session? Takuma Murakami