Yep, exactly. This last "update" was probably some sort of a test. The results were all weird, it was too soon, and now people are losing the newly gained Page Rank. I suspect the last "update" wasn't exactly what it appeared.
you no need to worry, one of my site having good backlinks agileinfoways dot com but this site pr reduce 3 to 2 but i am sure google will count my site and give good pr 4 so be patience and do seo