I've been looking at this, and have found that sometimes there seems to be less information available now than previously. One of my alleged potential ancestors - supposedly father of my ancestor Elizabeth Jones - is clearly wrong, but whereas previously I could see whose tree the supposed father came from and view him there, now when I click on Evaluate it comes up telling me that none of my matches' trees, nor any other members' trees, show him as father of my Elizabeth Jones.
So how and why is that person still showing as a potential ancestor? The information must be coming from somewhere, surely?