Okay, I removed the broen folder and added them only sharing with the machines once (BTW, Folder B was not shared in the way I said) and everthing seems to work. So, I guess the problem was the complex sharing.
Okay, I removed the broen folder and added them only sharing with the machines once (BTW, Folder B was not shared in the way I said) and everthing seems to work. So, I guess the problem was the complex sharing.