When use of the open water ladder is queued up (cannonball, climb up, etc all actions with the ladder including "Go Here" with the only access point being the ladder) the sims only demonstrate a error animation. When in water, the sim will swim up to the ladder and even into the ladder, but not climb up it.
No fences/walls are near the ladder and I also tried different foundations to see if that was the issue and it wasn't.
Edit By crinrict: Added Tag to Title