I just moved my ISPConfig3 (v. 3.0.3.3) install to a new virtual server running PHP Version 5.3.8 and now I'm not getting any site traffic showing up. I can see the web quotas for each site just not the traffic. You can see that last year there was traffic monitoring but after we moved my install and upgraded to 3.0.3.3 it's no longer logging traffic.
Check apache error log for errors of the software "vlogger" and check thet the mysql login details in /etc/vlogger-dbi.conf are correct.
Thanks Till! We checked and vlogger was installed but didn't have the correct database password in the config file. It's ISPConfig is showing traffic data now. Thanks again!