Tokens translated to empty values or not translated at all in sent mail.

I have a simple webform with a sender e-mail field and a recipient e-mail (as an hidden field): mails are sent, but tokens are translated to empty values... for example %email_values report nothing at all (online archive shows that fields are filled correctly) while something like %email[Name] is left untouched (appears as a normal text).

What can I check/debug? Thankx.

(note: I can dig into code, if needed, but I'd like an advise before: I'm thinking of embedding some drupal_set_message somewhere to check what's happening...)

Here's the template:

Submitted on %date

%email_values

Here's the mail (form has many text fields!)

Submitted on Tue, 26/03/2013 - 13:49

Here's the view online:

Name (some_text_here)
Surname (some_text_here)
e-mail [hidden]@[hidden]
Address ...
ZIP ...
City ...
Phone ...
Country ...
Message (msg)
Personal data management No
recipient [hidden]@[hidden]

...don't know if useful... there are many warnings like:

Notice: Trying to get property of non-object in webform_results_submissions() (line 47 of /...../sites/all/modules/(content)/webform/includes/webform.report.inc).
Notice: Trying to get property of non-object in webform_results_submissions() (line 48 of /...../sites/all/modules/(content)/webform/includes/webform.report.inc).
Warning: date_timezone_set() expects parameter 1 to be DateTime, boolean given in format_date() (line 2006 of /...../includes/common.inc).
Warning: date_format() expects parameter 1 to be DateTime, boolean given in format_date() (line 2016 of /...../includes/common.inc).