After nightly Archiving are values for Week and month not shown

I installed two weeks ago piwik 0.5.5. and place as first draft 2 Websites. One with small usage (1600 PI/Month) and one with higher Usage (180.000 pi/M).
To avoid problems with higher loss i use the concepts wich are written under
Means the nightly cronjob and the changes in config/config.ini.php: [General] time_before_today_archive_considered_outdated = 3600 and enable_browser_archiving_triggering = false

But after both changes i see now only the values after Days.
If i change to timeperiod week and Month i get only "No data for these diagramm) in all elements.

So question is, what happens wrong here? And what must i change to get “normal” result presentation?

has anyone an idea what todo?