aristotle - 3:12 pm on Jul 4, 2012 (gmt 0)
As the EMD wasn't anymore verified since March 2012 and the change of address also expired after 180 days (also in March), i got it verified again 4 days ago.
I don't understand what you mean by "verified". Are you talking about Webmaster Tools?
I found it pretty strange that the old domain started ranking again although it is already redirected since September 2011. It lasted 1 day and then again it vanished, both for the old as for the new domain. There was a slightly increase in traffic but not notable.
This also isn't clear to me. Why would re-verifying the old site cause both sites to "vanish"?