Fatal error (11).
Your files have been auto-saved.
Use `M-x recover-session' to recover them.
Your version of XEmacs was distributed with a PROBLEMS file that may
describe
your crash, and with luck a workaround. Please check it first, but do
report
the crash anyway. Please report this bug by invoking M-x
report-emacs-bug, or by selecting `Send Bug Report' from the
Help menu. If necessary, send ordinary email to
`crashes(a)xemacs.org'. *MAKE SURE* to include the XEmacs
configuration from M-x describe-installation, or equivalently
the file Installation in the top of the build tree.
I suggest changing this email to be xemacs-beta; both 21.4 and 21.5.