I don't know what happened. I received my medical exam request on Sep 26, 2012. I did the exam Sep 29, 2012. Send Oct. 10. ECAS shows "Medical results have been received". However, three months later I still didn't receive my PPR. :'(
You can apply for or extend your work permit whenever you applied for PR under CEC. I extended mine this August and got it at the end of September. I applied for PR April.
My ECAS changed to "We received your application for permanent residence on April 25, 2012.
We started processing your application on September 26, 2012."