Unreal engine freezing indefinitey 5.5 and 5.6.

Development Programming & Scripting Blueprint
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1

My editor keeps freezing indefinitely and I have to manually power off the my pc.

This happens on any action, moving a mesh, creating a blueprint, changing tabs, opening content folder etc etc. I have tried blank projects on both versions 5.5 and 5.6 and 5.6.1.

I have tried clean reinstalling windows.

my drivers are updated.

Before installing windows again I clean installed the drivers using a youtube video but that didn’t seem to work.

SPECS

PNY RTX 4070 Ti

AMD Ryzen 5 5600

MSI MAG B550M BAZOOKA

DDR4-3602 / PC4-28800 DDR4 SDRAM UDIMM

SAMSUNG SSD 850 EVO 500 GB

WD BLACK SN 770 1 TB

LOG FILE

MyProject2.log (115.8 KB) new blank project.

I also found this in the logs

Log file open, 10/03/25 00:23:16

LogWindows: Failed to load ‘aqProf.dll’ (GetLastError=126)

LogWindows: File ‘aqProf.dll’ does not exist

LogProfilingDebugging: Loading WinPixEventRuntime.dll for PIX profiling (from ../../../Engine/Binaries/ThirdParty/Windows/WinPixEventRuntime/x64).

LogWindows: Failed to load ‘VtuneApi.dll’ (GetLastError=126)

LogWindows: File ‘VtuneApi.dll’ does not exist

LogWindows: Failed to load ‘VtuneApi32e.dll’ (GetLastError=126)

LogWindows: File ‘VtuneApi32e.dll’ does not exist

LogWindows: Started CrashReportClient (pid=14700)

LogWindows: Custom abort handler registered for crash reporting.

LogInit: Display: Running engine for game: MyProject2

LogCore: UTS: Unreal Trace Server launched successfully

AND THIS

LogStreaming: Warning: Failed to read file ‘../../../Engine/Platforms/VisionOS/Content/Editor/Slate/Launcher/Platform_VisionOS_24x.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Platforms/VisionOS/Content/Editor/Slate/Launcher/Platform_VisionOS_128x.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Content/Slate/Icons/doc_16x.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Content/Slate/Common/ButtonHoverHint.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Platforms/VisionOS/Content/Editor/Slate/Launcher/Platform_VisionOS_24x.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Platforms/VisionOS/Content/Editor/Slate/Launcher/Platform_VisionOS_128x.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Content/Slate/Icons/doc_16x.png’ error.

LogStreaming: Warning: Failed to read file ‘../../../Engine/Content/Slate/Common/ButtonHoverHint.png’ error.

2

Hello there @sulitheonly!

That’s a quite peculiar scenario you are encountering. Investigating through your logs, they don’t show a concrete crash, just the editor hanging. There is one thing, though, a possible conflict with your current set of drivers. Check the line below:

LogD3D12RHI: Display: Batched command list execution is disabled for async queues due to known bugs in the current driver.

This means that UE is disabling a feature to avoid further instability. A common scenario with the newest releases from nVidia. So, I would suggest performing a clean install of those drivers, and to replaced with Studio version, as those tend to be more stable for engine work.

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If the issue persists, since you already check the OS, the remaining method would be a full uninstall/reinstall of all Epic software:

  • First, uninstall the engine, launcher, asset packs, etc
  • Next, open the registry directory HKEY_CURRENT_USER\Software\Epic Games\Unreal Engine\Builds, and delete any build entries
  • Finally, delete the folders %userprofile%\AppData\Local\UnrealEngine and %userprofile%\AppData\Local\UnrealHeaderTool
  • After that, no elements related to UE should be left in your system
  • Now, reinstall UE launcher from scratch, and only add the latest version of the engine
  • After the process is complete, test opening a blank project
3

ok nice catch maybe it will work, I saw a guide to clean reinstall nvidia drivers and the guy had me boot into safe mode which broke the login pin and I couldn’t login fortunately someone on reddit had a post that helped me login through the command prompt. Is there any other way to clean reinstall without encountering this bug cause it seems to be prevalent and hasn’t been fixed yet.

EDIT: Found the solution but accidently installed game ready drivers.