Lucky Charm on one character now applies that talent to the whole party.
* Lucky Charm is now a party-wide talent. Players no longer need to select the character with the talent to open containers
This is currently broken. While it is true that Lucky Charm does now apply to the entire party, the problem is the game doesn't consider multiplayer characters (or their henchmen) to be part of the same party.
Thus, in multiplayer games only one player (the one with Lucky Charm) still needs to loot everything. Looting done by other players (and their henchmen) will not count towards or trigger the Lucky Charm talent of other players.
This same not-really-a-party nonsense is probably related to the issue where NPC reputation modifier rewards aren't shared across a multiplayer "party" either - an issue which has been brought up on these forums a number of times now with no resolution despite several patches.