The error log is this:
(ignored) readFast past end (Packet size: 1144, packet type: 27)
It starts whenever the player's character becomes too big. My game uses custom characters, and in one example this begins when the character is made of around 270 individual parts. This hasn't started happening until after the recent BodyMover update.
From what I've seen, it stops the client's character from replicating to the server. The server cannot see the character moving, but the client can still move it around as normal. This can lead to some really weird situations: adding a BodyPosition to the character's torso from the server will still take effect on the client and move them to the position.
Any help would be appreciated. Thanks, -Poe
It means that you are sizing your player too big for the server to handle. Try sizing the player little by little until you get to the size you want.