Update – the following NVIDIA drivers worked for me:
NVIDIA Alternate Graphics Drivers for OS X 10.11.6 (15G12a Beta)
http://us.download.nvidia.com/wanl9YNPeTLf4ztbBsDkiMXsE4tbtMGp/WebDriver-346.03.15b01.pkg
Post:
http://www.tonymacx86.com/threads/n...cs-drivers-for-os-x-10-11-6-346-03-15.198033/
//
Ok, so I should have backed up first but I didn't because generally the security updates have not broken anything... but on this...
NVIDIA web drivers caution - Apple Security Update 2016 001 10.11.6
NVIDIA Alternate Graphics Drivers for OS X 10.11.6 (15G12a Beta)
http://us.download.nvidia.com/wanl9YNPeTLf4ztbBsDkiMXsE4tbtMGp/WebDriver-346.03.15b01.pkg
Post:
http://www.tonymacx86.com/threads/n...cs-drivers-for-os-x-10-11-6-346-03-15.198033/
//
Ok, so I should have backed up first but I didn't because generally the security updates have not broken anything... but on this...
NVIDIA web drivers caution - Apple Security Update 2016 001 10.11.6