It happened same to me. I did upfront it was showing passed and then it got changed to "You do not need a medical exam. We will send you a message if this changes". They asked me to re-do medical in December. I am July applicant and still didn't get nether DM nor PPR...
I don't think upfront medical is an issue ... I am Aug 10th Applicant, Background: Not Applicable Still for me.
I checked my application status through my local MP. They sent me the details of my application.
Medicals on my file are valid until Jan,2019
For me Security is not yet initiated, Criminality verification's are currently valid ...
For some reason, certain applications processing time gets delayed.
Am gonna call cic Monday morning ... Hope for the best.