One of the sites lost all ranks during Penguin 2.1. From what we know about Penguin 2.1 so far, there isn't anything in the site that doesn't conform to 2.1. However one development strikes me as a bit odd -
In WMT, under "Who Links The Most" and "Your most linked content" it says "No data available", which until the update was showing about 1100 links. Now, is Penguin 2.1 related to this bug, or is this bug responsible for drop in ranks and not Penguin 2.1?
Has this happened to anyone's Penguin 2.1 affected site?