That's a mouthful!
Okay the issue I've found is that sometimes (Not always) when you've got your lead character climbing up/down a ladder/vine, the rest of the group does not follow. In fact you usually have to bring them down one by one.
If you try to bring them down in these circumstances whilst still grouped together, the one that you already have at the bottom will climb back up/down and then get stuck.
Also, even though you have the ability to turn the camera, it is really easy to get stuck behind walls. having to turn the camera around to get them unstuck is frustrating and defeats the purpose of having a fade circle to see where your characters are.