This seems to work: use hook location
member_customfields and this code:
PHP Code:
if ($profilefield['profilefieldid'] == 7)
{
global $vbulletin;
require_once(DIR . '/includes/class_bbcode.php');
$bbcode_parser =& new vB_BbCodeParser($vbulletin, fetch_tag_list());
$profilefield['value']= $bbcode_parser->parse(unhtmlspecialchars($profilefield['value']),0, true);
}
I tried it out but did not do much testing.