In addition to the Crash Reporter: We have a user reporting this on the AnswerHub:
Upon Launching from the Editor, the Engine freezes at 35%, then after a short period, crashes with a crash report.
No known repro
UE4Editor-Core.dylib!void FGenericPlatformString::LogBogusChars<wchar_t, char>() UE4Editor-Core.dylib!operator<<() UE4Editor-DerivedDataCache.dylib!FMemoryDerivedDataBackend::LoadCache() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::ParseBootCache() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::ParseNode() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::ParseHierarchicalCache() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::ParseNode() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::ParseAsyncPut() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::ParseNode() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::ParseKeyLength() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::ParseNode() UE4Editor-DerivedDataCache.dylib!FDerivedDataBackendGraph::FDerivedDataBackendGraph() UE4Editor-DerivedDataCache.dylib!FDerivedDataCache::FDerivedDataCache() UE4Editor-DerivedDataCache.dylib!InternalSingleton() UE4Editor-DerivedDataCache.dylib!FDerivedDataCacheModule::GetDDC() UE4Editor-Core.dylib!GetDerivedDataCache() UE4Editor-Core.dylib!GetDerivedDataCacheRef() UE4Editor-Engine.dylib!GetGlobalShaderMap() UE4Editor!FEngineLoop::PreInit() UE4Editor!GuardedMain() UE4Editor!<Unknown> UE4Editor-Core.dylib!<Unknown> Foundation!Unknown() libsystem_pthread.dylib!<Unknown> libsystem_pthread.dylib!<Unknown> libsystem_pthread.dylib!<Unknown>
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-24658 in the post.