Report from Mate Wierdl <firstname.lastname@example.org>:
-- I create a new user, ab, so that I get a default environment.
-- I am running in runlevel 5, and I login as ab.
-- I click on the terminal icon in the panel to start a gnome
-- I start an xterm with
-- I start another gnome-terminal (from gnome-terminal) with
-- I click on the `X' in the upper right hand corner of
gnome-terminal. While both gnome-terminals disappear, xterm
Forwarded upstream to the GNOME bugtracker.
This is the correct behaviour. rxvt also behaves this way.