I don't know how to reproduce ether but this IS a thing.
this is happening in 14w30c to. I thought it was a new thing. guss i'm going to have to put up with it when the new release comes out 😞
The ladders look fine, but the hitbox is always aligned to the east/west axis. this only applies to ladders witch were placed before updating to 14w28a as placing a new ladder will crash the game.
Yes, they no longer seem to create massive amounts of lag when they derender. sorry for not responding sooner, I had squeezed this out right before a long vacation on the mountain. And thank you so much for fixing it!