I complained about this problem a few months ago to OST in private via email but it has not yet been fixed. It would seem to me that, if you were going to require your entire client base to update their profiles, that it should be tested and confirmed that they all can do it without problems before going ahead.
I am unable to update the card number linked to my standard bank account because the input field won't let me type in all the characters. That seems like a small problem to fix? Also, I've just done the update anyway and it said successful however my professional/non-professional setting has not been changed.
I wonder if OST could check it out?