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.