All Materials Broke in 4.11

I just copied my game and made opened it in 4.11 and all of my materials are broke. It appears to be a problem with my textures. I also opened one of the free examples that you can get and all of mats were broken in there too. If i open a fresh game with starter content the materials appear on the table, chairs and floor when i open the materials I get the same error that i get in my game.

“Error [SM4] …/…/…/Engine/Intermediate/ShaderIn176F83A12C493CF122A104AA99E15841.metal(0): No such executable”

I checked and that file is there. really stuck on this I dont know what else to do short of restarting my Comp.
Just so anyone who reads this knows im running on a Mac and im up to date.

reinstalled and restarted and the problem still exists

You’ll need to install Apple’s Xcode - we aren’t handling the case where Apple’s native metal shader compiler isn’t present (its part of Xcode) which why it then fails with the missing executable.

OK thanks. will do! but you might wanna find a way to get the word out. with out this I just wouldnt be able to use 4.11

We will fix it to use slower text shaders when the necessary offline compiler isn’t available - that this isn’t already happening is just an oversight.

I have the same problem on OX Yosemite, I have UE 4.11.2 and XCode 7.3 (7D175) but the problem is still present. Is there anything else I should do?

The Xcode thing worked for me. if you havent done that, do it. Also update if you havent done that already either

same here. Updated Mac OS to El Capitan and textures were “gone”. Updated Xcode to 7.3.1 (I believe the update was 3.8 GB).
Restarted the Unreal Engine and textures were “back” (did not need to restart mac)