after updating to 1.1 (1.1.1) the visits of one of our sites are almost 100% higher than before the update. As google analytics still reports the same average visits than before the piwik update it's probably a bug. All other website monitored by piwik behave normally.
I've attached a screenshot of the visits graph.
Attachment: Visits before and after the update
dup #1916 there is a beta fixing this issue already see comments