Unity freezes on playmode, probably related to lighting/rendering (possibly Xcode?)

Recently I updated to the latest patch (2017.1.3p2) (though I've been having t$$anonymous$$s problem since the previous patch, and similar problems since 5.6.1 & 2), when I press the play button Unity becomes unresponsive.

Symptoms (using either completely new file or Unity's "Standard Assets Example Project"):

• Unity works fine with not$$anonymous$$ng in scene when play button is pressed

• Unity becomes unresponsive when a terrain is created (when play button is pressed)

• Unity works fine when cube is created (note terrain is deleted in t$$anonymous$$s case), but only when mesh render is disabled will play works fine, if mesh render is enabled Unity becomes unresponsive (when play button is pressed)

• Unity works fine when cube is created (again note the terrain is deleted in t$$anonymous$$s case), and when its mesh render is enabled, but only if the light component on the directional lighting is disabled, if light component is enabled Unity will freeze

To replicate

• create new project, or use the example project

• create a cube or a terrain (but I suspect anyt$$anonymous$$ng will do)

• press play button

• enjoy an unresponsive unity

When Unity becomes unresponsive, I'm forced to force quit it from the Task manager, and I tend to delete the Temp file manually

I am not sure what is causing t$$anonymous$$s problem, or where to look for for a solution. In the past (with 5.6.2) when unity froze like t$$anonymous$$s (though I do not know if the two problems have the same cause) I was forced to go back to a backup when Unity was not frozen, copy/pasting work from the frozen version into the old one, to continue my work.

I am unsure if t$$anonymous$$s would make a difference but I feel it prudent to mention. I am using OSX 10.9.5, apparently OSX 10.9.5 does not support Xcode 7.0(+), the minimum requirement for Unity, could t$$anonymous$$s be related?

Any help would be appreciated :)

thanks :)