Solved
Leviathan - Namakli Dig Site - Glitch decending ladder
Location of the problem - the area where you battle a Banshee prior to activating the walkway. Kill the banshee then the walkway raises and you are able to cross and climb the ladder. There is a glit...
If you already found several threads about it, why post a new one? The usual tricks that are posted there still apply - lower the resolution, try window-mode or look up before when approaching the ladder. Not patch has addressed this yet.
