The delays are happening because of security checks. You can thank the political situation in Pakistan and its international reputation as a state that sponsors terrorism for this. I sent them an FBI background check certificate which is probably why they called me a bit earlier than some others.
It's just August 1st right now. You guys should write to your universities and say that you might be a week or two late. They shouldn't have a problem -- I've told my uni and they are fine with it. Also ask your unis when the last date is to arrive for the semester before you "forfeit" it, so to speak, so that you know how much leeway your uni is willing to give you.
Finally, I will again recommend that people who haven't gotten medical calls yet cosy up to their graduate program secretaries and ask them to send letters to the CHC asking for expedited processing. I've been told by previous applicants who got Study Permits that if the uni makes it seem like they really want you to come, it will have an effect on processing times.
