Oh - one more thing.

The gray periods in the hops 10 and 11 graphs are because of a route change. This is probably some kind of a load balancing system. You can see that by going to the Route change panel on the left (drag it open if it's closed) and then clicking on a time to show the route that participated at that point. Scroll through a few of these to see the routers included, and if you decide this is normal, you can "mask" this change, and supress the route change logic for this set of routers. To do that, right-click on hop 10 (or 11) and then select "Add route change mask". This will create a mask and also combine the data so that gray period doesn't appear.

- Pete