Thank you for help,
About the "A/a" button : in every case it's bbcode which is shown, but $vbulletin->GPC['message'] returns html.
Thank you for the parse_wysiwyg_html_to_bbcode, it works as expected (and the PlainText parser too)
But there should be
an other way to make the ckeditor return bbcode and not HTML : i did it yesterday but i don't know how
Thank you !