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Can't get UE to start, stuck at 45%

Hello everyone, I'm having trouble getting Unreal Editor 4.10.1 to start on my Mac OS X. It just sticks at "Initializing...45%" and will not go any farther. Let me know what I should do or what additional information is needed to figure out the problem. This is my first time ever trying to use Unreal Editor.


Product Version: UE 4.10
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asked Jan 04 '16 at 11:16 PM in Bug Reports

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avatar image MobbyBo Jan 04 '16 at 09:51 PM

Update: It has crashed now

avatar image Steve Hardister ♦♦ STAFF Jan 05 '16 at 09:51 PM

Hi MobbyBo,

This could be caused by a corrupted Boot.ddc:

(/Users/ ----------------- /Library/Application Support/Epic/UnrealEngine/4.10/DerivedDataCache/Boot.ddc)

With the editor closed, I suggest deleting all files from the DerivedDataCache folder and re-starting the editor.

If this does not work, then please follow these instructions:

  1. Allow the engine to crash so the Crash Reporter is present

  2. Cut and paste the contents of the Crash reporter into a empty text doc and attach here

  3. Also send us your stystem specs: You can find this in the Apple menu >About This Mac>More Info> Add the information from this window (serial # not necessary).


Steve H.

avatar image Joshmgrabo Jan 03 '17 at 02:39 AM

Hello, I just installed the software for the first time (version 4.14.1) and it's doing the same thing- stuck at 45%. Please advise. *I tried the above instructions but the file system is not the same for this version.

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avatar image Steve Hardister ♦♦ STAFF Jan 04 '17 at 09:24 PM

Delete the entire DerivedDataCache folder from the install directory:

C:\Program Files\Unreal Engine\4.14\Engine\DerivedDataCache

Let me know if this does not resolve the issue.

avatar image Stratego99 May 30 '17 at 10:02 AM

Not OP but this fixed it for me!

Thank you very much!

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2 answers: sort voted first

Hi MobbyBo,

Since we have not heard back from you in a few days, we are marking this "resolved" for tracking purposes. However, if you are still having a problem with the editor being stuck at 45% when opening, please follow the previously posted instructions and respond with the requested system specs and we will continue to diagnose the issue.


Steve H.

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answered Jan 11 '16 at 05:57 PM

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I downloaded first time UE version 4.18 Start editor and sleep in 45% I delete "C:\Program Files\Unreal Engine\4.14\Engine\DerivedDataCache", none, sleep in 45% Shhhh 15 minutes or more is sleeping 45%.

10 Gigas downloads in more than 6 hours, and it turns out that the program does not work. My beginning with Unreal Engine is very sad.

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answered Jan 26 '18 at 08:14 PM

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