Hi,
Not sure if the problem appeared after the recent upgrade, I think it did.
In reports, the date range picker does not allow selection prior to current month (November '15). If I edit manually the URL and set the dates I need directly in address bar, the report still shows up with dates starting from November 1st.
Note that all widgets on all dashboards do show data for the recent 30 days, and there is data in archive tables. I also tried reprocessing reports.
The calendar should start on the first day where your website was created. Are you saying that for an old website the date picker was starting this month?
I’m still wondering / don’t know, how this issue started occuring for you, but anyway you can fix it by executing this SQL query on your mysql database:
UPDATE piwik_site set ts_created=“2011-02-07” where idsite=1;
this will set the “creation date” of your website to February 2011 for idsite=1. you can run this query for all sites if needed. (with your chosen date)