Was There A Google Update Yesterday?

Over the past few days, I've seen some but not a ton of chatter about a possible update at WebmasterWorld.

The chatter began around July 30th at a high enough level for me to keep an eye on it and it continued through July 31st. Since it is the summer months, often this type of chatter is always a bit diluted. But here are some complaints in the thread:

What's happened?

My traffic has been decimated today across all sites, checking logs something happened last evening UK time.

From the looks on my multiple domains/subdomains, this week is a new Panda sherif in town. A bad one, also...

Also, the tracking tools showed signs up a smallish update:

Have you seen any changes in your verticals? It might be a Panda refresh or something else or nothing at all. The last unconfirmed update we covered was on June 28th and July 5th.

Forum discussion at WebmasterWorld.