I had a similar set up. The problem that i had was that you needed to log into that farm Facebook account before launching the game. Once the game launches you will be able to click on the gold mine to gift and receive. You then need to log out of that account as well as log out of the Facebook account. Then repeat steps (log into the next Facebook account and GOW account) very time consuming which is why i stopped all my gold mines. Not sure if that is what your problem is that your experiencing but perhaps a start to look into.