I can't access the main deck of thenPrydwen. When I try, it glitches me out the bottom and I can't do anything. I can do other quests no problem, this is an issue now as the quests that I need to access are up there. Any ideas?

i have the exact same problem. You are not alone.

I have confirmed that a save I made earlier on the main deck, will still load. I just can't get there now. I guess if they don't patch this, I'll have to restart from that point. I'll lose approx 9 hours ...