Here is the output of the archiver:
[2012-04-24 17:08:57] [8d1a5440] see doc at: How to Set up Auto-Archiving of Your Reports - Analytics Platform - Matomo
[2012-04-24 17:08:57] [8d1a5440] ---------------------------
[2012-04-24 17:08:57] [8d1a5440] INIT
[2012-04-24 17:08:57] [8d1a5440] Querying Piwik API at: http://www.XXXXXXX.com/index.php
[2012-04-24 17:08:57] [8d1a5440] Running as Super User: admin
[2012-04-24 17:08:57] [8d1a5440] Notes
[2012-04-24 17:08:57] [8d1a5440] - Reports for today will be processed at most every 600 seconds. You can change this value in Piwik UI > Settings > General Settings.
[2012-04-24 17:08:57] [8d1a5440] - Reports for the current week/month/year will be refreshed at most every 3600 seconds.
[2012-04-24 17:08:57] [8d1a5440] - Archiving was last executed without error 5 days 11 hours ago
[2012-04-24 17:08:57] [8d1a5440] Will process 3 websites with new visits since 5 days 11 hours , IDs: 1, 2, 3
[2012-04-24 17:08:57] [8d1a5440] ---------------------------
[2012-04-24 17:08:57] [8d1a5440] START
[2012-04-24 17:08:57] [8d1a5440] Starting Piwik reports archiving…
[2012-04-24 17:08:57] [8d1a5440] Archived website id = 1, period = day, Time elapsed: 0.126s
[2012-04-24 17:08:57] [8d1a5440] Archived website id = 1, period = week, 56300 visits, Time elapsed: 0.122s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 1, period = month, 72307 visits, Time elapsed: 0.132s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 1, period = year, 72307 visits, Time elapsed: 0.142s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 1, today = 899 visits, 4 API requests, Time elapsed: 0.522s [1/3 done]
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 2, period = day, Time elapsed: 0.092s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 2, period = week, 24942 visits, Time elapsed: 0.122s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 2, period = month, 30197 visits, Time elapsed: 0.132s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 2, period = year, 30197 visits, Time elapsed: 0.132s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 2, today = 440 visits, 4 API requests, Time elapsed: 0.479s [2/3 done]
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 3, period = day, Time elapsed: 0.088s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 3, period = week, 21805 visits, Time elapsed: 0.122s
[2012-04-24 17:08:58] [8d1a5440] Archived website id = 3, period = month, 26144 visits, Time elapsed: 0.122s
[2012-04-24 17:08:59] [8d1a5440] Archived website id = 3, period = year, 26144 visits, Time elapsed: 0.132s
[2012-04-24 17:08:59] [8d1a5440] Archived website id = 3, today = 346 visits, 4 API requests, Time elapsed: 0.465s [3/3 done]
[2012-04-24 17:08:59] [8d1a5440] Done archiving!
[2012-04-24 17:08:59] [8d1a5440] ---------------------------
[2012-04-24 17:08:59] [8d1a5440] SUMMARY
[2012-04-24 17:08:59] [8d1a5440] Total daily visits archived: 1685
[2012-04-24 17:08:59] [8d1a5440] Archived today’s reports for 3 websites
[2012-04-24 17:08:59] [8d1a5440] Archived week/month/year for 3 websites.
[2012-04-24 17:08:59] [8d1a5440] Skipped 0 websites: no new visit since the last script execution
[2012-04-24 17:08:59] [8d1a5440] Skipped 0 websites day archiving: existing daily reports are less than 600 seconds old
[2012-04-24 17:08:59] [8d1a5440] Skipped 0 websites week/month/year archiving: existing periods reports are less than 3600 seconds old
[2012-04-24 17:08:59] [8d1a5440] Total API requests: 12
[2012-04-24 17:08:59] [8d1a5440] done: 3/3 100%, 1685 v, 3 wtoday, 3 wperiods, 12 req, 1467 ms, no error
[2012-04-24 17:08:59] [8d1a5440] Time elapsed: 1.467s
[2012-04-24 17:08:59] [8d1a5440] ---------------------------
[2012-04-24 17:08:59] [8d1a5440] SCHEDULED TASKS
[2012-04-24 17:08:59] [8d1a5440] Starting Scheduled tasks…
[2012-04-24 17:08:59] [8d1a5440] No task to run
[2012-04-24 17:08:59] [8d1a5440] done
And yes, piwik_log_visit has valid rows! that mean visits are logged, but page views are not calculated!