Sometimes when climbing your picks bug out and you can no longer grab a ledge to climb or climb a wall with the picks. It is an annoying issue as fixing it seems to always require a game restart. Also sometimes you can just get stuck on a ledge when trying to climb and your character starts vibrating in place.
Also quite often when you grapple to a wall, the pick doesn't engage to hold onto the wall and you fall, unable to re-engage the pick.
Exactly the same problem. Once you zipline to the surface you wish to climb, there's no purchase on the surface and you immediately drop. Restarting the game resets the puzzle and you have to start over. An utter pain.