A white page is generally a suppressed PHP error. Check your server error logs which you should be able to access from your control panel - if not ask your hosts for them.
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Thu, 24 May 2018 13:04:53 GMT [error] [client 184.108.40.206] - www.mv-agusta.es - AH01215: PHP Parse error: syntax error, unexpected ''T' (T_ENCAPSED_AND_WHITESPACE), expecting ')' in /web/htdocs/www.mv-agusta.es/home/foro/language/es/acp/permissions.php on line 269: /web/htdocs/www.mv-agusta.es/home/foro/adm/index.php, referer http://www.mv-agusta.es/foro/adm/index.php?sid=2328f35d1e9e0bb316aec7e7c550175a
language/es/acp/permissions.phpfile. It may be that it did not upload correctly, in which case re-upload it.