Subscribe to newsletter bug?

Page "Edit Account" on frontend (= customer account) contains checkbox "newsletter" with name
"I would like to be notified occasionally via e-mail when there are new products or campaigns":

1) Check the checkbox "newsletter"
2) Insert Old Password
3) Save
4) Changes saved successfully

New value in database = 1 - OK
BUT checkbox "newsletter" is still unchecked... ? Bug or ... ?