Hi all I am having some problems when trying to share iTunes library with two user accounts in macOS Sierra 10.12.5. Me and my wife have separate macOS accounts and most of our data is located on external HD (HFS Plus formatted). So too is our iTunes library. iTunes in both of our accounts is configured to use the very same library located on external HD. (This is because our iTunes library is rather big one and our iMac has only 250 GB flash drive.) Our problem arises when following happens: my wife opens iTunes and leaves it open when she's done. After a while I log on to my account via fast user switching. (My wife doesn't log out and so the iTunes is still running in background on her account.) When I try to open iTunes I get an error message saying that iTunes Library.itl is locked. After that I am given three options: to stop, to select a new library or to create a new one. So my question is this: How do I unlock iTunes Library.itl? I have tried giving the right permissions (chmod 777) to the itl file, to the iTunes folder and to the external HD in its entirety but to no avail.