Profile editing: Cannot change e-mail address

Steps to reproduce:
1. Login to RosCMS.
2. Go to http://www.reactos.org/roscms/?page=user
3. Click "Edit My Profile". (link: http://www.reactos.org/roscms/?page=my&subpage=edit )
4. Change your e-mail address and save the changes. A message will appear:
"Check your email inbox (and spam folder) for the email-address activation email that contains the activation hyperlink."
5. Open the activation email. The details are correct, open the activation link. (Note: the activation link contains superfluous slashes after the host part and before "roscms/". But this is unrelated to the problem described.)
6. On this activation page, supply the new e-mail address. Or any other. Clicking on the "Save" button won't produce any different result, the page will be re-displayed and nothing is changed.

The related source code can be found here:
svn://svn.reactos.org/web/trunk/www/www.reactos.org/roscms/lib/view/HTML_User_ProfileEdit.class.php