The problem: There are some updates on client files, but the traffic and disk usage changes are not reflected in Plesk interface.
Why: Plesk counts statistics once a day (at 4:07 AM by default) with the help of the {Plesk_installation_dir}/admin/sbin/statistics utility, but not every time when you look at domain statistics. (see http://kb.parallels.com/en/752).
Solution: Update traffic and disk usage for all clients by running in a console:
/usr/local/psa/admin/sbin/statisticsTo update traffic and disk usage for a single domain, run:
/usr/local/psa/admin/sbin/statistics --calculate-one --domain-name=domainname.com
Now, refresh Plesk interface to see the changes :)
