Hi Luciana, I had the same problem and was directed to this thread, which sorted the issue for us: https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=fsl; 6c609b50.1510 On Jan 30, 2017 7:00 PM, "Luciana Moura" <[log in to unmask]> wrote: Dear experts, I have installed FSL 5.0.9 on Mac Pro (Sierra 10.12.1), with XQuartz installed (according to the instructions on FSL website). The installation went through without problems. I can launch FSL but when I launch FSLview its window stays frozen and I cannot open documents nor close FSLview. Any help on that matter would be greatly appreciated. Thanks a lot in advance, Luciana.