Oh, and I'm on OS X 10.10.3 with all system updates installed.
same here :-/
(haven't tried, *nor* I will!!, creating another user)
purchased and installed LR6 yesterday and it's been a nightmare until, among many other troubleshooting steps, I found the one about disabling GPU
my MacBook Pro 17" GPU (AMD Radeon HD 6770M) meets VRAM requirements, is *NOT* listed by ADOBE as incompatible *AND* according to APPLE is both OpenCL/OpenGL capable so... what's up here?
2011 macbook pro running 10.11
brand new 512g SSD
Me too. 2013 Macbook Pro Retina 13". What is up?