Candy's place was moved to the new area below the Neighborhood, so you'll be able to find the security guard there. A couple things accidentally got rolled back due to some software issues, and it seems that included the updated task description. We'll fix that for the next update.
I did find Candy's house and I was able to run through her quests, that just leaves me with Sabrina. The only quest I have at this point is Return to Sabrina at Hex-Rated, but she is in her room and I cannot talk to or get to her. I don't see a way of continuing on with Leslie or Ashley. Am I missing a step somewhere?