The first time I made it past Vienna, I, at some indeterminate point shortly thereafter, became stuck in a state of constantly holding the briefcase. Holding the briefcase limits your actions. Since I no longer actually had the briefcase, I could no longer stash it away or give it to the German. I could rewind a little and undo it, but it was still apt to re-appear. More specifically, the game seemed to think it was in the, let's say, 0th position in my inventory. The space where "nothing" normally resides. For example, if I had selected the key, and then clicked on the face icon to cancel the key, the game would then think I was holding the briefcase. Any situation in which an item was selected and canceled, or used incorrectly, would trigger this effect. I was able to work around it until it came time to diffuse the bomb just before Budapest. As the telegraph was an examinable item, I could not select it without also examining it, and upon exiting the close-up examination, I would then be holding the briefcase, with no way of canceling it or switching to anything else. I had to rewind all the way back to the concert to prevent it from happening, because once the value is set erroneously, there's no way for it to self-correct.

So fortunately I did not have this particular bug again. But now I cannot sleep. I've done all the prerequisites, as I had done them previously, except this time no one ever turned down my mattress for sleeping. Which means i just have to stand around for almost 2 hours of game time, while all the NPCs are sleeping, plus I miss the dream sequence. Once 10:30 rolls around naturally, here comes Alexei, and things seem back on track. I walk in on them and then go diffuse the bomb, talk to everyone important, and now I'm off to sleep to trigger the next event...except I still can't sleep. At this point I just let it run while I watched Netflix. Eventually, I suddenly went from standing in a hallway to lying on the floor, bound. I gave up at this point and quit for the evening, as I had already rewound significant chunks of time about 15 times in attempts to work around these and other bugs.

For a game that's fundamentally based on being totally immersed in the story, all these bugs make it a bittersweet reunion. I don't know if further work could be done to identify and resolve the root of these issues. For what it's worth, I recommend quitting and reloading frequently, as that seems to lessen the frequency of these issues for me.

Weird. I did so as well, and didn't have any problem at all. Must be some very specific conditions that trigger that bug.