Looks like a bug in Google Charts Library.
It have a new feature adding a div with aria-label="A tabular representation of the data in the chart." that holds the data of your graph in a table.
It is discussed here: https://groups.google.com/forum/#!topic/google-visualization-api/k2Kk772j2no
But for me it created a bug in the css causing the whole screen to be very wide with a bottom scroll. After some investigations with Firebug I noticed the
aria-label="A tabular representation of the data in the chart." have a style="position: absolute; left: -10000px" causing this endless horizontal scroll.
The solution for me was to add in the css a "display:none":
.small_graph svg + div {display:none;}
