There can be only one...

Hi Xemacs experts,

I have a strange problem. If I start XEmacs twice on some
computers (can also be 2 different ones) in our network,
the first one works all right, while the second one hangs
forever, as soon as I try to cut some text in any buffer.

If I kill the hanging XEmacs, I get this Lisp backtrace.

Lisp backtrace follows:

  own-selection-internal(CLIPBOARD " MOD pipe_depth_c;" nil nil)
  # bind (zmacs-region-stays data-type how-to-add type data)
  own-selection(" MOD pipe_depth_c;" CLIPBOARD)
  # bind (push string)
  own-clipboard(" MOD pipe_depth_c;" t)
  # bind (replace string)
  kill-new(" MOD pipe_depth_c;")
  # bind (undo-high-threshold tail verbose end start)
  kill-region(8965 8983)
  # bind (entire-line arg)
  kill-line-1(nil nil)
  # bind (arg)
  kill-line(nil)
  # bind (command-debug-status)
  call-interactively(kill-line)
  # (condition-case ... . error)
  # (catch top-level ...)

Does anyone know such behaviour? Can anyone tell me,
what to look for or at to solve the issue?

Thanks & Regards,
Gerhard Petrowitsch