My users are also experiencing this problem, though so far it only seems to occur for newly registered users, and once they clear their cookies everything seems to work fine. My site is WP 3.0.1 + BP (latest). This only started occurring in the last couple of weeks, I suspect it may be due to one of my plugins; I’ll troubleshoot later to check.
Just replace the span tag with whatever html you need. You could also enclose this in a function added to your functions.php file and call it from there.