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I noticed some big drops in the sites I monitor this update as well, yet rankings and traffic are business as usual. Patrick's link is helpful as are other's comments. The other thing I'd suggest is to monitor traffic, rankings and webmaster tools to make sure nothing is seriously wrong. If nothing arouses your suspicion, wait for the next update. This one was smaller than the last, root domains down by almost 10%. If you have a site with few incoming link sources, you're going to be more susceptible to sampling fluctuations.

Hi Grobro Do you have any other links that we are counting as follow that are using the "external nofollow" tag? Our devs are trying to find a pattern to rule out the possibility of the link not set as nofollow when we originally crawled it.