[Brent Deines]

It is possible that it is contamination, but if the ring goes around the entire perimeter of the break I doubt it.

A ten year old windshield could very easily be starting to de-laminate. I have replaced many windshields in that age range that had serious de-lamination issues around the edges, and have found that when repairing a chip on those they are much more likely to flower.

I have even had a few windshields that have flowered out several inches around the break, although they were on windshields that were probably 20+ years old and had serious de-lamination issues around the edges.