# IK Retargeter Causing UEFN To Crash

**URL:** <https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, UEFN, fortnite\
**Created:** [February 28, 2025, 5:20pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753 "2025-02-28T17:20:40Z")\
**Posts on this page:** 20\
**Page:** 1

<div class="post-metadata">

**Author:** ![TheJackBlade](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TheJackBlade](https://forums.unrealengine.com/u/TheJackBlade)\
**Post date:** [February 28, 2025, 5:20pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/1 "2025-02-28T17:20:40Z")

</div>

### Summary

When attempting to open IK Retargeter, UEFN will crash to desktop. This occurs predominantly with existing IK Rig assets, but has also occurred inconsistently with newly created ones.

### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Stability

### Steps to Reproduce

When double clicking on an IK Retargeting Rig, UEFN will crash. This occurs in several different projects and when the Retargeter contains any number of different meshes. This also occurs, although less consistently, when you create a new IK Retarget from scratch.

### Expected Result

When attempting to open the viewport for a Retargeter, you should not have UEFN crash.

### Observed Result

When attempting to double click the asset inside the Content Browser, UEFN crashes.

### Platform(s)

PC

---

<div class="post-metadata">

**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [February 28, 2025, 5:32pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/2 "2025-02-28T17:32:46Z")

</div>

> [@TheJackBlade](#):
>
> IK Retargeter

Hi @TheJackBlade ,

Please try the example in the Documentation first of all

[Transfer Character Animations in Unreal Editor for Fortnite | Unreal Editor for Fortnite Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/uefn/transfer-character-animations-in-unreal-editor-for-fortnite)

The assets created in UE5 often do not works and need to be developed in Fortnite version

---

<div class="post-metadata">

**Author:** ![thejerenator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thejerenator](https://forums.unrealengine.com/u/thejerenator)\
**Post date:** [March 3, 2025, 4:49am UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/3 "2025-03-03T04:49:58Z")

</div>

This is happening to me too. At first it crashed when I simply created the retargeter, but after multiple attempts at reopening the project I can get the retargeter to create and even add the skeletal meshes to it, but it crashes constantly and is unusable.

It’s super unstable and already made one of my projects essentially corrupted b/c it crashes as soon as the level loads in after adding the retargeter.

---

<div class="post-metadata">

**Author:** ![Getshotltd](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Getshotltd](https://forums.unrealengine.com/u/Getshotltd)\
**Post date:** [March 3, 2025, 9:18am UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/4 "2025-03-03T09:18:37Z")

</div>

Same issue. Nothing to do with migrated from UE5. We’ve been working on retargetting for a NPC for weeks in a project and now we cannot open the Rig or retarget without the editor crashing. This is since the recent update. This is an editor bug!

---

<div class="post-metadata">

**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\
**Post date:** [March 3, 2025, 2:35pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/5 "2025-03-03T14:35:02Z")

</div>

Getting someone to take a look.

---

<div class="post-metadata">

**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [March 3, 2025, 3:33pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/7 "2025-03-03T15:33:51Z")

</div>

> [@TheJackBlade](#):
>
> When attempting to open IK Retargeter, UEFN will crash to desktop.

Please install a page file over 32GB, as you can see my memory usage is over 20GB whilst opening the IK Retargeter.

 ![IK RetargeterPagingFileSize](https://d3kjluh73b9h9o.cloudfront.net/original/4X/3/9/1/39106675b72baa3ddafce5269cb0b317d53734f3.png)

see this post  
hi you may need to add a 64GB pagefile.sys, which I documented in  
[Install a bigger pagefile.sys](https://forums.unrealengine.com/t/cant-create-c-project-or-use-c/238169/2)  
Then everything works without crashing.

34.00 needs more virtual Memory for most of the Feature examples and now with the latest UE5.6 updates, which UEFN is based on .

Tried The video  
[Mixamo to Fortnite Using IK Rig Retargeting](https://www.youtube.com/watch?v=537dy2xjFVE)  
and with this 32GB there are not no crashes.

Check that in Windows 11 your project does NOT have OneDrive in its path, often UEFN will crash.

There is a warning message on new project creation but no checks on older projects

---

<div class="post-metadata">

**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\
**Post date:** [March 3, 2025, 6:44pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/8 "2025-03-03T18:44:39Z")

</div>

Thank you @Jimbohalo10

Folks, if you install a bigger pagefile, and this is still happening, please send me your UEFN logs.

[How to get your Fortnite logs](https://forums.unrealengine.com/t/how-to-get-your-fortnite-logs/682382)

---

<div class="post-metadata">

**Author:** ![thejerenator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thejerenator](https://forums.unrealengine.com/u/thejerenator)\
**Post date:** [March 3, 2025, 6:51pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/9 "2025-03-03T18:51:36Z")

</div>

This doesn’t appear to work. I set the page file sizes to 64GB for both of my drives and still getting the crash when working with the retargeter.

---

<div class="post-metadata">

**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [March 3, 2025, 6:54pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/10 "2025-03-03T18:54:44Z")

</div>

hi @thejerenator ,  
Well, we all need the logs as in the picture below please

 ![Logs Short cut](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/5/a/d5ad157174f1609404be215ae3bf4f7d66b9db99.png)

---

<div class="post-metadata">

**Author:** ![thejerenator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thejerenator](https://forums.unrealengine.com/u/thejerenator)\
**Post date:** [March 3, 2025, 6:56pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/11 "2025-03-03T18:56:18Z")

</div>

Sure thing, how do I send them?

---

<div class="post-metadata">

**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [March 3, 2025, 7:03pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/12 "2025-03-03T19:03:01Z")

</div>

Hi @thejerenator  
You can pick the current log as broken as one text, or better still use Windows compression, or use WinRAR and select zip of logs directory or leave it as ,Rar and drag fro Windows file explorer to zip/rar to the post.

If you need confidentiality, then send by PM to @Flak .  
If you send the logs in an open post, more devs can look into the crash.

---

<div class="post-metadata">

**Author:** ![thejerenator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thejerenator](https://forums.unrealengine.com/u/thejerenator)\
**Post date:** [March 3, 2025, 7:06pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/13 "2025-03-03T19:06:40Z")

</div>

Ok, here you go:

[Logs.zip](https://forums.unrealengine.com/uploads/short-url/gYN5Xas5bpcZSJn3vHj1tJBAjqD.zip) (5.2 MB)

---

<div class="post-metadata">

**Author:** ![thejerenator](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thejerenator](https://forums.unrealengine.com/u/thejerenator)\
**Post date:** [March 3, 2025, 7:12pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/14 "2025-03-03T19:12:56Z")

</div>

Maybe related - the model in the retargeter has 113 bones - is it possible I’m exceeding a bone count limit for UEFN?

EDIT: I tried removing bones, reskinning the model to have 74 bones, deleted the previous 113 bone version from the project, recreated the IK Rig for it, and the retarget works to set up, but closing and reopening the retargeter also crashes so seems like not the root of the issue.

---

<div class="post-metadata">

**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [March 4, 2025, 9:42am UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/15 "2025-03-04T09:42:28Z")

</div>

hi @thejerenator ,

Looking at the most recent UEFN Log

Please can you [Verify your Installation using this post](https://forums.unrealengine.com/t/urc-exe-and-urc-dll-get-flagged-as-malware-from-microsoft-defender/1802519/5)

```auto
[2025.03.03-18.53.14:331][675]LogAssetEditorSubsystem: Opening Asset editor for IKRetargeter /DinosaurGame01/Dinos/RTG_Raptor.RTG_Raptor
[2025.03.03-18.53.14:332][675]LogChaosDD: Not creating Chaos Debug Draw Scene for world World_1

```

So the  
Opening Asset editor for IKRetargeter  
ON  
/DinosaurGame01/Dinos/RTG\_Raptor.RTG\_Raptor

```auto

[2025.03.03-18.53.14:374][675]LogActorComponent: RegisterComponentWithWorld: (/Engine/Transient.World_1:PersistentLevel.AnimationEditorPreviewActor_0.DebugSkelMeshComponent_0) Already registered. Aborting.

```

```auto
[2025.03.03-18.53.14:407][675]LogSkeletalMesh: Display: Waiting for skinned assets to be ready 0/1 (dino_Raptor) ...

```

The Crash error starts here, this is difficult because protected parts of UEFN do NOT have the symbols table links available, but as highlighted above the problem is a crash in  
Opening Asset editor for IKRetargeter

> [2025.03.03-18.53.14:785][675]LogWindows: Error: === Critical error: ===  
> [2025.03.03-18.53.14:785][675]LogWindows: Error:  
> [2025.03.03-18.53.14:785][675]LogWindows: Error: Fatal error!  
> [2025.03.03-18.53.14:785][675]LogWindows: Error:  
> [2025.03.03-18.53.14:785][675]LogWindows: Error: Unhandled Exception: EXCEPTION\_ACCESS\_VIOLATION writing address 0x0000000000000118  
> [2025.03.03-18.53.14:785][675]LogWindows: Error:  
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff89bf59d96 ntdll.dll!UnknownFunction   
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff792dd2e34 UnrealEditorFortnite-Win64-Shipping.exe!UnknownFunction   
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff78cec2f08 UnrealEditorFortnite-Win64-Shipping.exe!UnknownFunction   
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff788376da3 UnrealEditorFortnite-Win64-Shipping.exe!UnknownFunction   
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff7883752d2 UnrealEditorFortnite-Win64-Shipping.exe!UnknownFunction   
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff78838239f UnrealEditorFortnite-Win64-Shipping.exe!UnknownFunction   
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff788381638 UnrealEditorFortnite-Win64-Shipping.exe!UnknownFunction   
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff78838060c UnrealEditorFortnite-Win64-Shipping.exe!UnknownFunction   
> [2025.03.03-18.53.14:785][675]LogWindows: Error: [Callstack] 0x00007ff788377a77 UnrealEditorFortnite-Win64-Shipping.exe!UnknownFunction

---

<div class="post-metadata">

**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\
**Post date:** [March 4, 2025, 11:23am UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/16 "2025-03-04T11:23:19Z")

</div>

The fix for this is targeted for a future update. Thank you for reporting!

---

<div class="post-metadata">

**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\
**Post date:** [March 11, 2025, 12:52pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/17 "2025-03-11T12:52:24Z")

</div>

FORT-867959 is ‘Closed’ as ‘Fixed’. The issue will be addressed in 34.10.

---

<div class="post-metadata">

**Author:** ![RYZZIE](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ryzzie/32/1061593_2.png) [@RYZZIE](https://forums.unrealengine.com/u/RYZZIE)\
**Post date:** [May 15, 2025, 12:15am UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/18 "2025-05-15T00:15:12Z")

</div>

Hi everyone,

I’ve just tried using the IK Retargeter, and ran into the exact same issue as described above.  
Build Version: 5.6.0-42223143+++Fortnite+Release-35.00

I’ve tried cleaning the cache, re-installing, creating a new project but it crashes everytime as soon as I try to open a newly created IK Retargeter asset.

Crash Report:

```auto
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000000002a8

UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
user32
user32
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
kernel32
ntdll

```

Log:

```auto
[2025.05.14-23.59.09:931][595]LogAssetEditorSubsystem: Opening Asset editor for IKRetargeter /Synty_TEST/RTG_NewRetargeter.RTG_NewRetargeter
[2025.05.14-23.59.09:932][595]LogChaosDD: Not creating Chaos Debug Draw Scene for world World_3
[2025.05.14-23.59.09:935][595]LogStreaming: Display: FlushAsyncLoading(2372): 1 QueuedPackages, 0 AsyncPackages

```

Not sure if this is related but while troubleshooting I also found that reloading the FN Asset “Medium Base Skeleton” which is located in: /All/Fortnite/Characters/PlayerBasics crashes the Engine as well.

Object Path:  
/Game/Characters/Player/Male/Male\_Avg\_Base/Fortnite\_M\_Avg\_Player\_Skeleton.Fortnite\_M\_Avg\_Player\_Skeleton

---

<div class="post-metadata">

**Author:** ![Trazey](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Trazey](https://forums.unrealengine.com/u/Trazey)\
**Post date:** [May 15, 2025, 4:33pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/19 "2025-05-15T16:33:39Z")

</div>

My IK Retargeter from before 34.10 is still crashing, and my new IK Retargeters are no longer working. Is there any current work around or fix to get a custom skeletal mesh on an IK Rig for a guard?

---

<div class="post-metadata">

**Author:** ![EVNT\_Creative](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@EVNT\_Creative](https://forums.unrealengine.com/u/EVNT_Creative)\
**Post date:** [June 1, 2025, 9:16pm UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/20 "2025-06-01T21:16:25Z")

</div>

@Flak  
Do we have any updated information on a fix for this? 34.10 has come and gone and this is still an issue keeping us from using UEFN’s custom NPC guard system for several projects.

---

<div class="post-metadata">

**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [June 2, 2025, 11:28am UTC](https://forums.unrealengine.com/t/ik-retargeter-causing-uefn-to-crash/2364753/21 "2025-06-02T11:28:21Z")

</div>

hi  
Please try and use the UEFN Feature Project

[Animation and Cinematics in Unreal Editor for Fortnite | Unreal Editor for Fortnite Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/uefn/animation-and-cinematics-in-unreal-editor-for-fortnite?application_version=1.0)

[Talisman MetaHuman Template in Unreal Editor for Fortnite | Unreal Editor for Fortnite Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/uefn/talisman-metahuman-template-in-unreal-editor-for-fortnite)

After using this for over an hour UEFN 35.20 did not crash

Followed the documentation in  
[Transfer Character Animations in Unreal Editor for Fortnite | Unreal Editor for Fortnite Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/uefn/transfer-character-animations-in-unreal-editor-for-fortnite)

[IK Rig in Unreal Engine | Unreal Engine 5.6 Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/unreal-engine/ik-rig-in-unreal-engine?application_version=5.6)

**Warning quote**

_ **This process creates new animation assets for your target character from the source. You cannot assign animations that are on your source character to your target character without following this process.** _

> As you go through this tutorial, you will practice the retargeting workflows with a Fortnite character using the FN\_Mannequin asset inside the [Animation Starter template](https://dev.epicgames.com/documentation/assets/animation-101-template-in-unreal-editor-for-fortnite) in Unreal Editor for Fortnite (UEFN).

Open UEFN and create a new project, ensuring that you select the **Animation Starter template** from the **Feature Examples** section.

Tried many examples in

> [Animation and Cinematics in Unreal Editor for Fortnite | Unreal Editor for Fortnite Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/uefn/animation-and-cinematics-in-unreal-editor-for-fortnite?application_version=1.0)

Also tried  
[Skeleton Editor in Unreal Engine | Unreal Engine 5.5 Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/unreal-engine/skeleton-editor-in-unreal-engine?application_version=5.5#skeletontree/retargetsources)

and this works fine

My PC does have a 32GB page file manually added, which mentioned in past post  
[How to add a 32gb pagefile](https://forums.unrealengine.com/t/cant-create-c-project-or-use-c/238169/2)  
my virtual memory usage is 21.7 GB of 38GB just idle using the UEFN Example jumps to 34GB when opening the IK editor and adding a [virtual bone](https://dev.epicgames.com/documentation/en-us/unreal-engine/skeleton-editor-in-unreal-engine?application_version=5.5#skeletontree)

Update  
With the release of 5.6.0 at the State of Unreal on 3rd June please visit the new Methuman features at

[MetaHuman leaves Early Access with a feature-packed new release - MetaHuman](https://www.metahuman.com/en-US/news/metahuman-leaves-early-access-with-a-feature-packed-new-release)

The further update to UE5.6 is relevant to UEFN IK Retargeted, which uses a different version of MetaHuman. Therefore, UE4/5 Standard Engine Metahuman engine projects will crash.  
They will pass UEFN Validity Checking but WILL crash UEFN as different data is being sent into IK Editor unchecked