Version control rollbacks not fixing corrupt project?

Development Getting Started & Setup
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1

Bizarrely, none of my rollbacks on my version control fix a corrupt uproject. UE just crashes after the splash screen. Other things I’ve tried:

  • tried deleting cache folders (deriveddatacache, intermediate, saved)

  • tried verifying engine

  • other uprojects still open fine

  • Last night, I updated my AMD gpu’s driver (had to force a restart mid-session).

  • resetting the default map in the gameengine.ini config lets me actually briefly open UE– but then it crashes with the same error.

  • Here’s a pastebin link of the log and a snippet of it:

    [2025.08.29-18.13.56:629][ 0]LogMeshUtilities: Finished distance field build in 6.5s - 259x259x259 sparse distance field, 12.4Mb total, 0.5Mb always loaded, 39% occupied, 0 triangles, SM_blockout_base
    [2025.08.29-18.13.56:629][ 0]LogThreadingWindows: Error: Runnable thread Foreground Worker #0 crashed.
    [2025.08.29-18.13.56:630][ 0]LogWindows: Error: === Critical error: ===
    [2025.08.29-18.13.56:630][ 0]LogWindows: Error:
    [2025.08.29-18.13.56:630][ 0]LogWindows: Error: Fatal error!
    [2025.08.29-18.13.56:630][ 0]LogWindows: Error:
    [2025.08.29-18.13.56:630][ 0]LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x000000002000000c
    [2025.08.29-18.13.56:630][ 0]LogWindows: Error:
    [2025.08.29-18.13.56:630][ 0]LogWindows: Error: [Callstack] 0x00007ff926c493d0 amdxc64.dll!UnknownFunction

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2

can you backup your config files in /Config and delete them?

maybe there’s a setting that’s causing the crash. maybe related to rendering but it’s hard to say, better to try removing everything.

3

Yeah, I think you might be right?

Migrated my content folder to a brand new project and it kind of fixed the problem–
but just today, I turned on Hardware RayTracing and MegaLights on in Project Settings which caused the exact same crash to happen again. Might be related to updating my graphics driver (AMD RX 7900XT).

Issue was resolved (I think?) by editing out those 2 settings in GameEngine.ini in the Config folder:

r.RayTracing=True

r.MegaLights=1

Will keep the post updated.

4

that’s what i thought. and that’s why i recommended removing the rendering settings.

raytracing is intensive and a bit new. megalights is still a bit experimental. so i wouldn’t be surprised.

it might not mean that you can’t run them, but maybe you need to fine tune the settings a bit.

if my answer helped to fixe the issue, please consider marking at solution.

i’m glad you found a solution even if temporary, thanks for sharing.