I have found a bug with xquartz 2.7.11 It seems that installing xquartz on 10.12 and gnubg runs fine. Also, installing xquartz on 10.11, gnubg will also run fine. The bug that I found is this. 1. install xquartz 2.7.11 on OSX 10.11 2. then upgrade OSX to 10.12 3. gnubg no longer works. I might get through one whole game, but the game will freeze and there is no other option but to quit out of X11 and restart. I tried deleting gnubg and reinstalling quarts 2.7.11 but this did not work. Do you have a fix coming for this? I am running this on an iMac that is Late 2009, but my dad also has the same problem on a machine he bought 2 years ago. Is there a way to uninstall xquartz so I can reinstall it? that might be a temporary fix.
You can see https://www.xquartz.org/FAQs.html, but you shouldn't need to uninstall first. Please do make sure you re-install after major OS upgrades because the OS upgrade removes the /usr/X11 and /usr/X11R6 symlinks.
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