I'm playing with my wife and whenever we need to reload a save file, our controlled characters get swapped, I play as hers and vice versa.
She presses ESC - Session and switches them back, clicks Accept and our characters are now translucent and immovable, we can't do anything but move the camera at that point. Furthermore if she tries to go back to the main menu, the game gets stuck at 0 % loading screen, I can leave fine.
We do not use mods, the installation is fresh.
I couldn't find any info on that particular but online yet, maybe someone here knows more? Thanks in advance, it really ruins the experience...