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I also got ghost update last Friday!! I called CIC and I figured that it must have been my eligibility which is now passed. She said only some security checks are still in progress. May be your situation is the same.

Your ghost update can also be a PPR request. But unfortunately mine wasn't. When I called they said "your background is half way done", dont know what that means.
 
Your ghost update can also be a PPR request. But unfortunately mine wasn't. When I called they said "your background is half way done", dont know what that means.

As I understand, the background check has not two or three, but a decent number of different checks. Mine also wasn't a PPR request, cause they said that some security checks are still in progress. What I got from browsing the forum, average wait time from ghost update to PPR ranges from one day to one month being the longest.
There were a couple of people who have waited for several months from the first ghost update, but i guess is when they fall under security screening.

Anyways, I really think that your ghost update also means passing eligibility.