after upgrading to Piwik 2.1.0, I didn’t get any more tracking data. Even my log_visit table remains at round about 1.4mio entries. I already read the troubleshooting (Piwik doesn’t track any visits and pages, and shows “There is no data for this report” in all reports), but there is no hint on my problem.
In my server logs, there are no errors. Also all requests to piwik.php always returns http code 200 (OK). In order to eliminate any error, I already made a fresh install of the latest Piwik version, copied back my config.ini.php, but the problem remains.