After updating all of my sites to Piwik 1.9.1, I am unable to view more than two pages of the visitor log without receiving the "No data to report" message. The first page of results will show correctly, and most of the time the second page will as well. However, thereafter I only see the "No data to report" message. Along with this, if I attempt to change the number of results displayed, I get the same error message.
Please let me know if there is additional information that I can provide. As I commonly comb my logs, this is really a show-stopping bug.
Keywords: visitor log no data
Fixed in latest beta: builds.piwik.org/piwik-1.9.2-b3.zip