Notable discussions I have found so far
https://www.reddit.com/r/secondlife/comments/3gvnqe/stop_playing_sl_on_os_x_i_am_a_mac_userread_if/
https://community.secondlife.com/t5/Second-Life-Viewer/OSX-10-11-El-Capitan/td-p/2971689/page/2
https://community.secondlife.com/t5/Second-Life-Viewer/Second-Life-Viewer-4-on-Mac-OS-X-10-11-2/td-p/2988576/page/2
It would seem to be a fault with the Nvidia drivers, from what I am reading
http://www.sluniverse.com/php/vb/alternative-sl-clients/111026-gpu-crash-all-viewers-el.html
http://jira.phoenixviewer.com/browse/FIRE-16821
http://www.xmir.org/tech-talk/viewer-gpu-crash-fixed-in.html
Some are saying this is a good viewer
https://www.alchemyviewer.org/pages/downloads.html
