8 new, 15 fixed.
Install it over 0.9.1. (This is the same file as the 0.9.2-rc1 test build, so seeing "rc1" in your log is normal.) It uses a new protocol (50), so it doesn't play with 0.9.1: everyone in a session needs it.
Friends see missiles, Fat Man shots, shells and explosive rounds fly. Each still explodes once.
Doors that chain to others, doors a script opens quietly, two-state gates and doors NPCs open are shared.
World traps are shared: mines, tripwires, bear traps and grenade bouquets go off once, in every game.
Cars, barrels and fuel tanks a player shoots are wrecked in every game and explode once in each.
Objects an NPC or an explosion knocks about move in every game.
A friend's frame copy of power armor can't be entered, opened with Transfer, or given to a companion. Borrowing a friend's power armor is coming in a later version.
A friend somewhere your game doesn't have (a DLC you don't own) shows as out of reach: the player list says so, their compass marker goes, and teleporting to them is refused until they're back.
The host can allow more than 4 players (iMaxPlayers in F4Multiplayer.ini). More than two has been tested less.
Power armor frames no longer duplicate. A friend's frame copy, or the copy of a friend's character, could survive loading a save and end up in your next save; now a load removes every copy the mod placed.
Loading a save twice in one run could crash when the save held a leftover copy of a friend's character. New saves no longer get one. If an older save has one, the mod says so after it loads: save, restart the game and play from the new save.
Every explosion hits once: missiles, grenades thrown at a friend, cluster rockets, a robot's self-destruct, a suicider's nuke.
A friend's shot no longer hits you on your screen: their figure in your game fired real shots at you. Their shots now follow where they actually aim. A gun bash is no longer heard as a gunshot, and the clicking that could start after a join or a leave is gone.
A hit that takes an enemy over from a friend's game is no longer healed back by a late health update from that game.
An enemy is the same in every game: no more legendary in one game and plain in the other, or a settler in one and a scavenger in the other.
Settlers can be given jobs during a session.
An item a friend dropped and you scrapped in workshop mode no longer comes back (a dupe).
Taking the last item from a container in a home no longer empties a friend's own stash in it.
Radiant quests are remembered across loads, restarts and sessions, and yours is no longer stopped when a friend's can't start in your game.
A friend's Codsworth search reaches the host's story in order.
A player who loads a save in power armor is seen in it.
A locked session takes back players whose game crashed or whose connection dropped; new, kicked and banned players still can't join.
Friends' figures no longer stutter while someone uses Jet or VATS.
The revive count and cooldown carry through a reconnect, and pings pressed a second apart all go through.
disable and markfordelete.