Encountered with Unity 2017.1.1 on Mac OS 10.12 (also happens with a clean install of the latest patch release, p3). I was working on a project that I'd had open for several days without exiting the editor. I needed to restart my computer so I quit Unity and rebooted my mac. Now, Unity hangs when opening any project, including a brand new one. This occurs after selecting the project from the launch window. No error message or crash window appears, it just silently hangs with "application not responding" in the dock. One time in about 15 attempts I was actually able to open a new, blank project, but the rest of the time it has failed, and I'm completely unable to work. Any suggestions? I'll just be sitting here banging my head against a wall, fondly remembering a time long ago when my tools were reliable.