Reno - 5:50 pm on Jun 13, 2011 (gmt 0)
Not even Google engineers have a clue in Google support forums
I think that is a very important observation, one which we should keep in mind as we spend endless hours trying to fix a problem which we cannot even define.
The current version of Google is apparently the most complex ever, with many hundreds of variables that react depending on how the variables around them react. The possibilities could be close to infinite. Perhaps it does not equal the nuclear launch codes, but it may be getting close. With such complexity comes uncertainty, and therefore:
Even the chief algo engineers may in fact not know for sure how Panda will unfold; if you suffered a severe fall, they may not know specifically why that happened, or what you should do to restore your previous rankings; and they may not know when or even if a site can come back.
IF that's the case, then I wish they'd just come and out and say "we don't know". But of course because they thoroughly embrace FUD, they will not say anything so honest & clearcut. And so, as walkman said, "many have made changes and seen no real and sustainable increase in traffic." With such extraordinary complexity in the ranking calculations, IMO that will almost certainly be the status quo from now on.