The problem is as follows:
Sometimes the menus disappear for some reason. I cannot narrow down in which cases. Once the toplevel menu disappear, it is impossible to use it, unless M-x menu-bar-mode will be invoked twice, or (not in every case) C-x b and C-x 5 b and problematic windows will be put into a new frame. It is kind of annoying especially with such applications like GNUS which menus tend to be a very important cheat-sheet.
I am attaching screen shots as a reference.
btw: report-emacs-bug in my case had it own problems too... but i have workaround it and used gmail.
In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.18.3)
of 2010-04-04 on spec-desktop
Windowing system distributor `The X.Org Foundation', version 11.0.10604000
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: nil
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: en_GB.UTF-8
value of $XMODIFIERS: nil
Major mode: Tuareg
Minor modes in effect:
M-x <up> <C-backspace> C-g C-g M-x r e p o <tab> e
<backspace> r <tab> <return>
Loading /home/spec/.emacs.d/org-clock-save.el (source)...done
Applying style hooks... done
Desktop: 31 buffers restored.
For information about GNU Emacs and the GNU system, type C-h C-a.
goto-history-element: Beginning of history; no preceding item
Read only text copied to kill ring
Quit [2 times]
Making completion list...