strange display of glyphs in a second window

[François Patte]

Bonjour,


I am facing a problem if I open a new frame (C-x 5 2): some glyphs are
displayed as if emacs could not read them (a square with the code of the
glyph).

For instance & is displayed as: 00 in a red square.
                                26

Also in the bottom bar, the name of the open file is displayed in the
same manner.

I don't understand why... The first frame is OK!

How to correct this?

thank you.
-- 
François Patte
Université Paris Descartes