Editor crashed when building and won't open; nor will the Epic Game Launcher

Hey all,

I went to build my project after changing a cube map in my reflection sphere, and the editor crashed. I can no longer open the editor, the game launcher, or even install a new freshly downloaded game launcher without getting a permissions error. Running as admin does nothing.

“Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access this item”

How can I fix this? Here is my log before the crash happened.

[2018.10.04-13.58.49:246][883]LogFileHelpers: Auto-saving content packages took
0.618 [2018.10.04-13.59.55:522][125]LogSlate: FSceneViewport::OnFocusLost() reason 0
[2018.10.04-14.00.27:451][666]MapCheck: New page: Map Check
[2018.10.04-14.00.27:553][666]Cmd: MAP
REBUILD ALLVISIBLE
[2018.10.04-14.00.27:553][666]LogEditorServer:
Rebuildmap Clear paths rebuilt
[2018.10.04-14.00.28:536][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
MatineeCam_mat, compiling.
[2018.10.04-14.00.28:551][666]LogShaderCompilers: Display: Shaders left to compile 1
[2018.10.04-14.00.28:551][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
m_gradient, compiling.
[2018.10.04-14.00.28:566][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
m_floor, compiling.
[2018.10.04-14.00.28:589][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
DefaultMaterial, compiling.
[2018.10.04-14.00.28:606][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
defaultMat, compiling.
[2018.10.04-14.00.28:623][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
stone_onyx_Inst, compiling.
[2018.10.04-14.00.28:642][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
m_metal1, compiling.
[2018.10.04-14.00.28:665][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
m_ASP4, compiling.
[2018.10.04-14.00.28:673][666]LogWindows: Warning: CreateProc failed: Access is
denied. (0x00000005)
[2018.10.04-14.00.28:674][666]LogWindows: Warning: URL: C:/Program Files/Epic
Games/UE_4.20/Engine/Binaries/Win64/ShaderCompileWorker.exe
“C:/Users/WM29457/AppData/Local/Temp/UnrealShaderWorkingDir/0C78E82F47787E92E4FB72B910E87414/0/”
12976 0 WorkerInputOnly.in
WorkerOutputOnly.out
-communicatethroughfile -TimeToLive=20.000000 -Multiprocess [2018.10.04-14.00.28:674][666]LogWindows: Windows GetLastError: The operation
completed successfully. (0)
[2018.10.04-14.00.28:688][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
diamond_princess, compiling.
[2018.10.04-14.00.28:720][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
accent_HyacinthP, compiling.
[2018.10.04-14.00.28:747][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
accent_diamonds_stadium, compiling.
[2018.10.04-14.00.28:769][666]LogMaterial: Display: Missing cached shader map for
material FDebugViewModeMaterialProxy
base_Hyacinth, compiling.
[2018.10.04-14.00.54:359][666]LogWindows: Warning: CreateProc failed: Access is
denied. (0x00000005)
[2018.10.04-14.00.54:360][666]LogWindows: Warning: URL:
…/…/…/Engine/Binaries/Win64/CrashReportClient.exe
“C:/Users/WM29457/Documents/UnrealProjects/4.20/RDoS_5.6/Saved/Crashes/UE4CC-Windows-B98B6C2640976B570AEB3A9F24EA0FA1_0000”
-AppName=UE4-RDoS_5 -CrashGUID=UE4CC-Windows-B98B6C2640976B570AEB3A9F24EA0FA1_0000 -DebugSymbols=…....\Engine\Intermediate\Symbols
[2018.10.04-14.00.54:360][666]LogWindows: Could not start CrashReportClient.exe
[2018.10.04-14.00.54:360][666]LogMemory: Platform Memory Stats for Windows
[2018.10.04-14.00.54:360][666]LogMemory: Process Physical Memory: 2420.93 MB
used, 4116.28 MB peak
[2018.10.04-14.00.54:360][666]LogMemory: Process Virtual Memory: 6108.83 MB
used, 6342.67 MB peak
[2018.10.04-14.00.54:360][666]LogMemory: Physical Memory: 8741.56 MB used,
7491.61 MB free, 16233.17 MB total [2018.10.04-14.00.54:360][666]LogMemory: Virtual Memory: 7902.96 MB used,
7491.61 MB free, 134217728.00 MB total [2018.10.04-14.00.54:360][666]LogShaderCompilers: Display: Shaders left to compile 0
[2018.10.04-14.00.54:360][666]LogWindows: Windows GetLastError: The operation
completed successfully. (0)
[2018.10.04-14.00.54:361][666]LogWindows: Error: === Critical error: ===
[2018.10.04-14.00.54:361][666]LogWindows: Error:
[2018.10.04-14.00.54:361][666]LogWindows: Error: Fatal error:
[File:D:\Build++UE4\Sync\Engine\Source\Runtime\Engine\Private\ShaderCompiler\ShaderCompiler.cpp]
[Line: 1003]
[2018.10.04-14.00.54:361][666]LogWindows: Error: Shader Compiling thread
exception:
[2018.10.04-14.00.54:361][666]LogWindows: Error: Fatal error:
[File:D:\Build++UE4\Sync\Engine\Source\Runtime\Engine\Private\ShaderCompiler\ShaderCompiler.cpp]
[Line: 1783]
[2018.10.04-14.00.54:361][666]LogWindows: Error: Couldn’t launch C:/Program
Files/Epic
Games/UE_4.20/Engine/Binaries/Win64/ShaderCompileWorker.exe!
[2018.10.04-14.00.54:361][666]LogWindows: Error:
[2018.10.04-14.00.54:361][666]LogWindows: Error:
[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff97433c58
KERNELBASE.dll!UnknownFunction
[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff86446850
UE4Editor-ApplicationCore.dll!UnknownFunction

[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff4f6162fc
UE4Editor-Core.dll!UnknownFunction
[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff4f5a51db
UE4Editor-Core.dll!UnknownFunction
[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff4d7acb2d
UE4Editor-Engine.dll!UnknownFunction

[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff4d7ad34f
UE4Editor-Engine.dll!UnknownFunction

[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff4d78646f
UE4Editor-Engine.dll!UnknownFunction

[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff4d7c8dd8
UE4Editor-Engine.dll!UnknownFunction

[2018.10.04-14.00.54:361][666]LogWindows: Error: [Callstack] 0x00007fff4f876b7c
UE4Editor-Core.dll!UnknownFunction
[2018.10.04-14.00.54:362][666]LogWindows: Error: [Callstack] 0x00007fff4f8717c7
UE4Editor-Core.dll!UnknownFunction
[2018.10.04-14.00.54:362][666]LogWindows: Error: [Callstack] 0x00007fff97858364
KERNEL32.DLL!UnknownFunction
[2018.10.04-14.00.54:362][666]LogWindows: Error: [Callstack] 0x00007fff9a327091
ntdll.dll!UnknownFunction
[2018.10.04-14.00.54:362][666]LogWindows: Error:
[2018.10.04-14.00.54:362][666]LogWindows: Error:
[2018.10.04-14.00.54:362][666]LogWindows: Error:
[2018.10.04-14.00.54:362][666]LogWindows: Error:
[2018.10.04-14.00.54:539][666]LogExit:
Executing StaticShutdownAfterError
[2018.10.04-14.00.54:719][666]LogWindows: FPlatformMisc::RequestExit(1)
[2018.10.04-14.00.54:723][666]Log file
closed, 10/04/18 09:00:54

Thanks!

Turns out this was an issue on our network at work, and not an editor problem at all, thankfully!