1. don't know, looks like the cable has just popped off the pulley, that cable also rubs the seat and marks it.

2. the latch and pivots are way too flimsy to lift a very heavy seat, your lucky not snapped it. Use two hands in future one to hold the pivot area firm and the other to lift the latch. Also, shove the seat fully forward, tilt it, get a file and take some metal off the hook and bar at the bottom, both sides, this will free it a lot more and grease it too. Bit at a time and test as you go.