I get an SQL error:
General Error
SQL ERROR [ mysqli ]

Unknown column 'pf_nieuwsbrief_ontvange' in 'field list' [1054]

SQL

UPDATE phpbb_profile_fields_data SET pf_nieuwsbr = '1', pf_nieuwsbrief_ontvange = 1 WHERE user_id = 2

BACKTRACE

FILE: includes/db/mysqli.php
LINE: 116
CALL: dbal->sql_error()

FILE: includes/ucp/ucp_profile.php
LINE: 329
CALL: dbal_mysqli->sql_query()

FILE: includes/functions_module.php
LINE: 361
CALL: ucp_profile->main()

FILE: ucp.php
LINE: 321
CALL: p_master->load_active()

steps to reproduce:
1. create an costum profile field with a name longer then 20 characters (I tried it with boolean)
2. try to change it in your ucp