Based on Laura's issue, I'm going to add a couple of known issues which are work-aroundable.
If your character changes view from a tall to a short sprite, the module screen will snap into a new position. This is because it's aiming for the 'head' of the sprite. To get around this, switch targetCharacter to a dummy character (at the same co-ordinates) while you make the transition.
If you're playing as a different character to the player character at game start, and the module has been off, then when you switch it on you the camera will pan from the old character it was following to the current character*. To get around this, set the targetCharacter to the player before calling ChangeRoom, so the camera starts out looking in the right place.
Similarly, if you change a player's X and Y position in room_load, the module will pan from where they used to be to where they are now. If you can, include the desired co-ordinates in the ChangeRoom function. If not, try using a Dummy character who's already in the right place.
*This would be desirable behaviour if you were using it to pan between characters in a cutscene, etc.
