trunk rev 8115.
1. see attached screenshots. in large scale one, notice the white are at the left hand side. when zoomed in on this area, it can be seen that it should not have been white.

2. on the smaller scale graph, take a look at two spikes at the right hand side. compare them to the same spikes in the large scale graph - while biggest spike tops at ~155 in the large scale graph, it tops at 15 in the small scale graph.