Leviathan DLC Ladder Glitch
In the second combat mission in the DLC, during the gauntlet run to the Elevator, I can no longer progress. Shep gets stuck on the ladder and can't slide down from the roof. It seems to be caused by a clipping issue, where shep is further back from the ladder than the trigger to start the sliding animation. So he's sliding down a solid floor. Problem is I can't go backwards either, as the ladder I used to climb up does the same thing.
I have done this on my first run. I shut down and reloaded my save, still did it. Loaded the quicksave, also did it. Loaded my Restart Mission save, and it STILL did it. THERE'S NO WAY OUT!
Now I can't finish the DLC, or the game on its second run. I am now officially sad.
When going onto the ladder, wait until the animation starts and then look up as much as you can. Also try pressing escape to pause the second that animation starts, then return to the game- this sometimes works.
What I did was a combination of the two, and that solved it for me.