Unreal Editor 4.12.2 stuck at Initializing 10%or18% on Mac OS 10.12 sierra

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Unreal Editor 4.12.2 stuck at Initializing 10% or 18% on Mac OS 10.12 sierra. How to fix it?

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I’m having the same issue. For now I’m going to revert to 10.11

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I’ve been struggling with this all day today. So far, I’ve had to build mono from source, which required getting a few dependencies for that, which required getting homebrew to run on 10.12, and that required making sure I had the Xcode 8 beta installed and that xcode-switch was set to the beta version.

After that I tried running the promoted branch (didn’t work), so now I’m back to trying to build the release branch with all the proper tooling place. We’ll see how THAT goes.