Finally I found the solution. WP-minify cause an error in Javascript.
I just tried with a default theme but it does not work either.
My plugin enable are :
bbPress
bbPress Enable TinyMCE Visual Tab
Light – Responsive LightBox
NextGEN Gallery by Photocrati
Regenerate Thumbnails
Relevanssi
Responsive Lightbox
Sidebar Login
Theme My Login
TinyMCE Advanced
User Role Editor
WP-PageNavi
WP Minify
WP Wall
You can test on http://www.lsa-clan.fr/wordpress/forums (register is open)
I have the latest version of TinyMCE bbPress Enable Visual Tab and I have the same problem with or without the advanced TinyMCE plugin.
Update :
When I create a basic user, I see TinyMCE but when I click on text TinyMCE disappear and I can’t go back to visual.
