Sorry about that, I did not intend to insult anyone, French is my first language and maybe that sound worst that I intended it to be.
For the update you could add a line to check for buddypress xprofiles and check this field instead of the bbpress one :
xprofile_get_field_data( 'Signature', $user_id );
sorry again about that.
I think it was made to work with buddypress groups whitout xprofiles yes. A simple update could fix that.
Safer way to allow img tag :
simply add that to your function.php
// Add img tag to filter
function gawd_allowed_tags() {
global $allowedtags;
$allowedtags['img'] = array( 'src' => array () );
}
add_action('init', 'gawd_allowed_tags', 10);