Piwik doesn't track any visits :S


I am using Piwik for about a year, but have a strange behaviour since Oct 08: For all my websites actions are still counted correctly. But there are no visits.

No new records on table piwik_log_visit since October 8th…

What can be the problem?

Any idea? Thanks for your help!

PS: I’ve inserted a record manually in the DB, and the reports show that visit correctly.