Please write in English if possible, because the Emacs maintainers
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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

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Starting up Emacs, when I enter anything in *scratch* buffer, it's
truncated at the top by toolbar. Please see the first attached file.

I need to trun toolbar off, and then on to make them show correctly.
Please see the second attached file.

This happens for Cocoa port of both Emacs 23.1 and HEAD.

From system log I see dozens of error messages as

,----
| Invalid image for toolbar item
`----

Through grepping the source files I found it's in nsmenu.m in function
update_frame_tool_bar (line 1225).

It means valid_image_p check failed.
 
My image-types shows

(png gif tiff jpeg xpm xbm pbm)

and from attached files you can see toobars are in fact created
correctly.

I check tool-bar-map and below is part of it for "Visit New File...".

 (new-file menu-item "Visit New File..." find-file :enable
 (menu-bar-non-minibuffer-window-p) :help "Specify a new file's name, to
 edit the file" :image (find-image (cond ((not (display-color-p)) (quote
 ((:type pbm :file "new.pbm" :foreground "black" :background "grey75")
 (:type xbm :file "new.xbm" :foreground "black" :background "grey75")
 (:type xpm :file "low-color/new.xpm") (:type xpm :file "new.xpm"))))
 ((< (display-color-cells) 256) (quote ((:type xpm :file
 "low-color/new.xpm") (:type xpm :file "new.xpm") (:type pbm :file
 "new.pbm" :foreground "black" :background "grey75") (:type xbm :file
 "new.xbm" :foreground "black" :background "grey75")))) (t (quote
 ((:type xpm :file "new.xpm") (:type pbm :file "new.pbm" :foreground
 "black" :background "grey75") (:type xbm :file "new.xbm" :foreground
 "black" :background "grey75"))))))

Evaluation of find-image part shows:

,----
| (image :type xpm :file "/usr/local/share/emacs/23.1.50/etc/images/new.xpm")) 
`----

So it seems correct.

The first time I notice this is when I was in Gnus. I evaluated Gnus
tool bar map, and it's correct.

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