Hey all,
There's a bug in multiplayer where if one of the PC's listens in on a conversation that another PC is having with an NPC, then a black dialogue box will float above their head and will remain even after the conversation has finished. The black speech bubbles will follow the PC around and it stops the host from saving the game. It's caused a few issues, with us mainly having to replay a section a few times, and the only way we seem to be able to remove it is to have the affected PC's talk to someone. Sometimes it removes it. Sometimes it doesn't. The affected players can't see the icon above their PC's head, but the other players can.
Cheerios