Several of my windows have the same problem. The shoes plastic top that connects with the cord has broken off. I don't know how to get to it to examine and replace.
First picture shows a shoe that is connected to the cord. Second picture shows a disconnected cord and a shoe that's plastic cord holder is broken. The piece that is broken looks like it is part of the shoe or could be a small piece that connects with the shoe through that Phipps screw. I don't have a clue what the holes in the pictures by the side of the shoes are for?
