In the summary widget in admin control panel, there is a problem with the tooltip shown after hovering over the most recent days (last dots on the graph).
As the tooltip is shown 20px to the right of pointer and the pointer is close to the right end of the window, a scroll bar appears and the tooltip is not visible (not at all for the last day, a little for the previous day etc) Example
If you add this code:
var wdw = jQuery( window ).width(); if(item.pageX > (wdw - wdw*0.08)) item.pageX -= 170;
before calling showTooltip() in file: google-analytics-summary-widget.php line 84 problem seems to solve as shown here