This is a regular and longstanding crash in 4.17 that has occurred since at least 4.14. Users have not provided any descriptions of their actions when the crash occurred.

There has been some previous discussion related to this error message in [Link Removed] (auto-expired).

Steps to Reproduce

repro steps currently unknown

Assertion failed: OLEReferenceCount == 0 [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsWindow.cpp] 
[Line: 557] Not all references to window are released, 1 left

UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::DrawWindows_Private() [slaterhirenderer.cpp:989]
UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [slateapplication.cpp:1492]
UE4Editor_Slate!FSlateApplication::DrawWindows() [slateapplication.cpp:1188]
UE4Editor_Slate!FSlateApplication::TickApplication() [slateapplication.cpp:1773]
UE4Editor_Slate!FSlateApplication::Tick() [slateapplication.cpp:1591]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3278]
UE4Editor!GuardedMain() [launch.cpp:166]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134]
UE4Editor!WinMain() [launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:253]

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ComponentUE - Editor - UI Systems - Slate
Affects Versions4.
Target Fix4.18
Fix Commit3604327
Main Commit3621569
Release Commit3643070
CreatedAug 22, 2017
ResolvedAug 23, 2017
UpdatedApr 27, 2018
View Jira Issue