Unreal Engine 5.7 Released

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:wrench: Solution: UE 5.7 Crash on Launch - “Unable to use default cache graph”

Symptoms:

  • Unreal Engine 5.7 crashes on startup

  • Error message: Unable to use default cache graph 'InstalledDerivedDataBackendGraph' because there are no writable nodes available

  • Previous versions (5.6, 5.5) work normally

Root Cause:

The ZenServer (DDC cache server) is corrupted or blocked and cannot start, preventing UE 5.7 from accessing the cache.

Quick Fix:

  1. Close Unreal Engine completely

  2. Delete these 2 folders:

    • C:\Users\[YourName]\AppData\Local\UnrealEngine\Common\Zen

    • C:\Users\[YourName]\AppData\Local\UnrealEngine\DerivedDataCache\Zen

    (If you don’t see AppData, enable “Hidden items” in File Explorer)

  3. Restart UE 5.7 from the Epic Games Launcher

Result:

  • :white_check_mark: ZenServer reinstalls automatically

  • :white_check_mark: First launch: shader recompilation (normal)

  • :white_check_mark: Subsequent launches: everything works perfectly!

Note: This solution works without needing the temporary -DDC-ForceMemoryCache parameter that forced recompilation every time.

Additional troubleshooting (if the above doesn’t work):

  • Check if port 8558 is blocked: netstat -ano | findstr :8558

  • Temporarily disable antivirus

  • Run Unreal Engine as Administrator

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