diberry - 3:43 pm on May 10, 2013 (gmt 0)
Interesting. If what I'm seeing is not due to a Penguin update, then that means I had other issues with my site.
There IS one Panda refresh date on which I had a small traffic loss, which I thought was due to another factor. I later got that traffic back and lost it again on dates that are within a couple of weeks of Panda refreshes/updates but don't seem to coincide very well. Still, maybe this is a Panda recovery I'm seeing.
Or could it be something else entirely? My site's not an EMD and I don't believe any of the other known algo changes have affected it.