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

**URL:** <https://forums.unrealengine.com/t/unreal-editor-4-12-2-stuck-at-initializing-10-or18-on-mac-os-10-12-sierra/360761>\
**Category:** Community & Industry Discussion\
**Tags:** loading, initialize, unreal-engine, editor, UE4, question\
**Created:** [June 14, 2016, 3:24pm UTC](https://forums.unrealengine.com/t/unreal-editor-4-12-2-stuck-at-initializing-10-or18-on-mac-os-10-12-sierra/360761 "2016-06-14T15:24:12Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![wukakuki](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/wukakuki/32/1134338_2.png) [@wukakuki](https://forums.unrealengine.com/u/wukakuki)\
**Post date:** [June 14, 2016, 3:24pm UTC](https://forums.unrealengine.com/t/unreal-editor-4-12-2-stuck-at-initializing-10-or18-on-mac-os-10-12-sierra/360761/1 "2016-06-14T15:24:12Z")

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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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**Author:** ![Sigurd0079](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sigurd0079](https://forums.unrealengine.com/u/Sigurd0079)\
**Post date:** [June 17, 2016, 2:46pm UTC](https://forums.unrealengine.com/t/unreal-editor-4-12-2-stuck-at-initializing-10-or18-on-mac-os-10-12-sierra/360761/2 "2016-06-17T14:46:32Z")

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

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**Author:** ![grislebeard](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@grislebeard](https://forums.unrealengine.com/u/grislebeard)\
**Post date:** [July 2, 2016, 11:40pm UTC](https://forums.unrealengine.com/t/unreal-editor-4-12-2-stuck-at-initializing-10-or18-on-mac-os-10-12-sierra/360761/3 "2016-07-02T23:40:05Z")

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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.