Delete scw temporary files while it's compiling
UE4Editor_Engine!DoReadTaskResults() [shadercompiler.cpp:147]
UE4Editor_Engine!FShaderCompileThreadRunnable::ReadAvailableResults() [shadercompiler.cpp:966]
UE4Editor_Engine!FShaderCompileThreadRunnable::CompilingLoop() [shadercompiler.cpp:1092]
UE4Editor_Engine!FShaderCompileThreadRunnableBase::Run() [shadercompiler.cpp:582]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:73]
UE4Editor_Core!FRunnableThreadWin::GuardedRun() [windowsrunnablethread.cpp:26]
kernel32!<Unknown>
ntdll!<Unknown>
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-17227 in the post.