I had the opposite problem. I lit a fire on the top floor of the construction site building (the unfinished building) close to Berezino, inside the walls, just by the stairs. No effect, and I didn't get warm. Then I went down and into the restaurant/pub right across the street, closed the door and re-lit the fire. Instant effect, and I became warm.

You wake up without CPR as well. Once your shock value goes down below your blood level you wake up. Shock goes down over time, so as long as your blood level is stable, you wake up automatically. Without a message telling you if the CPR was successful there's little way of knowing if it was the reason an unconscious player woke up.

Do you get any sort of message saying it was successful? See, this is a strange problem on so many levels. Giving someone CPR (chest compressions and mouth-to-mouth) doesn't magically wake them up from an unconscious state. Chest compressions is something you give to someone who's heart has stopped. Giving it to a healthy person risks killing them.

I had an incident while playing with a friend just now. The server we were on restarted (no message received) so we logged off and rejoined, and before the spawn lag let my friend move he'd been downed by a zombie. Luckily, I got in just a second or two later close by my friend, took out my gun, killed the zombie and rushed up to bandage my friend. He was still unconscious of course, but I checked pulse and it was strong. Now, since I have emergency healthcare training, including CPR and other techniques IRL I didn't at first try to use CPR on my friend because realistically using chest compressions on a person who is alive has a high risk of killing them (the technique is used when a person's heart has stopped), and my friend did have a pulse. But we waited and waited and he didn't wake up, so we decided to see if CPR worked differently in the game. So I kept doing compressions for quite a while but with no result.

It would be nice to learn how CPR have been implemented in the game. Is it realistic (a poor man's defibrillator) or unrealistic (a poor man's epipen)? If it's the former, then there's a bug in unconscious state that doesn't let an unconscious player wake up. If it's the latter, CPR doesn't work.

I have experienced some lag as I entered larger cities, but I always assumed it was when all the items and zombies in the city spawned, and all the extra textures rendered.

Haven't experienced any crashes however. Do you get any kind of error message from your computer?

I reproduced this bug as of last night, ie about 12 hours ago.

I uploaded a screenshot of some M4's I cloned inside a house (there are five more M4's lying under a pine tree outside, but it was too hard to get a good screenshot of them.

The cloned weapons can indeed be picked up and handled individually.

Confirmed. I'm attaching another screenshot of the haybale and an image marking the place on the map.