I love this plugin. I had it installed on about 12 sites running 3.10, 3.1.1 and 3.1.2.
Just 2 days it ago, it now only showing the last 7 days in the graph (even though the date range is for the last 30 days). The graph says my traffic has gone up 5X the typical amount.
This happened on all 12 sites. Even on some I have not been onto in weeks.