Can't get longer date period statistics (no replies)

Hi,

I installed Piwik few weeks ago and I have a bit of a problem with getting data. Statistics don't show if I select date range longer then 2 or 3 days. For instance if I select week, month or date range 5, 8 or 30 days nothing happens, but short error message in red that shows for a second. Message: uplodaing data still blinks like it is really doing something. But nothing happens.

I know that data is there because if I select one certain day I can see everything. I tried to view stats in different browser, I deleted browsing history, but nothing helps...

Anybody had this kind of a problem and found out how to solve it?

Best regards, Miha