Not recognising bounce emails

Upgraded to 3.3.0
Using Chrome
cpmmailer.co.za/lists/admin

I want to see what email addresses are being bounced. When I go to STATISTICS > STATISTICS OVERVIEW the BNCS emails and views are not reflecting - they both appear as “0”. Earlier today the views was working correctly but since then I have upgraded to 3.3.0 and made various changes to the config.php file and it isn’t working any more. The email box does not have any emails in it but when I go to SYSTEM > MANAGE BOUNCES > VIEW BOUNCES I can see that the system was recognising bounces up until 27-08-2016 so something must have changed around then.

Not sure if this makes a difference but my email address settings are:
Incoming server: mail.cpmmailer.co.za
Outgoing (SMTP) server: smtp.cpmmailer.co.za
SMTP Authentication: On (same Username as incoming)
SMTP Port: 587

Please see my config.php setting below and let me know if you can see if anything is wrong or have any advice. Thanks in advance.

# Message envelope. This is the email that system messages come from
# it is useful to make this one where you can process the bounces on
# you will probably get a X-Authentication-Warning in your message
# when using this with sendmail
# NOTE: this is *very* different from the From: line in a message
# to use this feature, uncomment the following line, and change the email address
# to some existing account on your system
# requires PHP version > "4.0.5" and "4.3.1+" without safe_mode
$message_envelope = 'bounce@cpmmailer.co.za';

# Handling bounces. Check README.bounces for more info
# This can be 'pop' or 'mbox'
$bounce_protocol = 'pop';

# set this to 0, if you set up a cron to download bounces regularly by using the
# commandline option. If this is 0, users cannot run the page from the web
# frontend. Read README.commandline to find out how to set it up on the
# commandline
define('MANUALLY_PROCESS_BOUNCES', 0);

# when the protocol is pop, specify these three
$bounce_mailbox_host = 'mail.cpmmailer.co.za';
$bounce_mailbox_user = 'bounce@cpmmailer.co.za';
$bounce_mailbox_password = 'PASSWOED';

# the "port" is the remote port of the connection to retrieve the emails
# the default should be fine but if it doesn't work, you can try the second
# one. To do that, add a # before the first line and take off the one before the
# second line
$bounce_mailbox_port = '110/pop3/notls';
#$bounce_mailbox_port = "110/pop3";

# it's getting more common to have secure connections, in which case you probably want to use
#$bounce_mailbox_port = "995/pop3/ssl/novalidate-cert";

# when the protocol is mbox specify this one
# it needs to be a local file in mbox format, accessible to your webserver user
$bounce_mailbox = '/var/spool/mail/listbounces';

# set this to 0 if you want to keep your messages in the mailbox. this is potentially
# a problem, because bounces will be counted multiple times, so only do this if you are
# testing things.
$bounce_mailbox_purge = 1;

# set this to 0 if you want to keep unprocessed messages in the mailbox. Unprocessed
# messages are messages that could not be matched with a user in the system
# messages are still downloaded into phpList, so it is safe to delete them from
# the mailbox and view them in phpList
$bounce_mailbox_purge_unprocessed = 1;

# how many bounces in a row need to have occurred for a user to be marked unconfirmed
$bounce_unsubscribe_threshold = 5;

Hola tengo el mismo problema, pudiste resolverlo.
me podrías ayudar.