I think the count on links with each date range are buggy.
Example for a specific link in my outlinks.
in Day : 2 clicks
In Weeks : 2 clicks
In Month : 20 clicks
In Year : 12 clicks !?
In fixed date range for year 2011 : 32
I think the sql for Year don’t take the last month (actually October)
I have the same problem.
Installed piwik 1.6 on linux on 21st of October and get different click counts when selecting Month/Year or Date Range.
Furthermore the visitors and actions increase hour by hour and then one or two times a day the numbers drop by 10 or 20% and then increase again.
The database tables seem to increase only.