XML rpc utf8 validation failed

[tfr (Openerp)]

here is the trace back
C:\Program Files (x86)\OpenERP 6.0\Client\library.zip\widget\view\list.py:738: GtkWarning: gtk_tree_view_unref_tree_helper: assertion `node != NULL' failed
C:\Program Files (x86)\OpenERP 6.0\Client\library.zip\widget\view\form_gtk\textbox.py:81: GtkWarning: gtk_text_buffer_emit_insert: assertion `g_utf8_validate (text, len, NULL)' failed

So now what happened ?
Try to open in a lead an email store in history or reply to this email
=> the field details is empty

here is the mail

"""
Madame, Monsieur,

j'ai passé commande d'un lot de 3 livres chez vous.

Pouvez-vous me confirmer la commande et me donner une date de livraison

d'avance merci
bonne journée

Lefebvre Jean-Louis
071/36.11.31
CpeHn Asbl
Rue Chapelle Beaussart 80 Bat 15
6030 Charleroi

"""

[Ravi Gadhia (OpenERP) (rga-openerp)]

Hello tfr (Openerp),
         I have tested this bug on nightly build of today openerp-client-setup-6.1-dev-20110801-r3524.exe and client-6.0 both are work fine.
         would you please provide us more information(locale setting) to reproduce this issue