Right-click and choose Properties . Go to the Compatibility tab. Check Run this program as an administrator . Check Disable full-screen optimizations . Click Apply and OK . 5. Clear the Unreal Engine DirectX Shader Cache

Aggressive heuristic scanning by third-party antivirus software (like Avast, Bitdefender, or Windows Defender) frequently misidentifies the Unreal "shipping" configuration as a false positive threat, locking its execution. Open the and type Windows Security .

-ExecCmds="r.SetRes 1920x1080f" -NoStartupMovies -dx11