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I still have this issue in my Piwik installation (version 2.4.1).
The website adds the locale as first URL element, thus the first level elements of the page list contain a lot of sub-pages. As an example, page "de" is listed with 3409 pageviews for a given timeframe. If I expand clicking +, it just shows "No data in this category. Try to "Include all population"."
How can I "include all population"?
Btw. the behaviour seems not to be very consistent. Sometimes I get this message, sometimes I get the data (independent of the date range).
I can't really reproduce it.
E.g. right now I opened Piwik, the date range preselected was 2014-08-06 - 2014-08-12 (including today), expanding "de" showed the error message. Changing the date range "fixed" it, even if I then switched back to the same range.
May this be caused by an Ajax call timing out or something like that? I'll try to check the background requests with Firebug the next time it happens.