Unreal Engine Issues

Gameplay Effects with instant duration fail to be predicted if a duration magnitude was previously set

The Duration Magnitude property is not zeroed out if a Gameplay Effect's duration policy is changed from HasDuration to Instant. As a result, UAbilitySystemComponent::ApplyGameplayEffectSpecToSelf e ...

Crash when closing the editor during Play if a web browser widget is in use

Crash when closing the editor during Play if a web browser widget is in use. A web browser was added to the screen during Play in Editor. After this the editor is close via the [X] in the upper righ ...

BUG IN CLIENT OF LIBDISPATCH: crash on KeyPress down in WebBrowser

FCEFWebBrowserWindow::OnKeyDown() InternalCefBrowser->GetHost()->SendKeyEvent(KeyEvent); is processed on the UE4 GameThread, inside the Chromium Embedded Framework (CEF) it appears to call a syst ...

Steam VR overlay not available when launching packaged game on Oculus Rift through SteamVR without disabling Oculus plugins

Steam VR overlay not available when launching packaged game on Oculus Rift through SteamVR with -hmd=steamvr. Disabling Oculus plugins (except for input) allows it to be summoned normally. Same th ...

Texture cube references appear to stay in memory

Texture cube references appear to stay in memory after they have been added to a blueprint. They continue to take up memory even after the variable reference has been deleted. ...

Converting a modular character to a static mesh can result in a crash or in an asset with corrupted data

Using Subversion results in a hanging attempt to sync to source control

Using Subversion on a Mac to connect to an online repository causes the Source Control settings window to hang indefinitely and never succeed in connecting ...

Can Ever Affect Navigation does not detect updates to collision settings at runtime

When a mesh has its collision updated during runtime the navigation around the mesh does not update. Workaround: If the mesh is set to simulate physics then updates to its collision will update nav ...

Lighting Build Fails With High Density Foliage

Trying to build lighting on a map with high density foliage will fail lighting build or cause the editor to crash. This occurs in 4.15, 4.16, 4.17, and 4.18. There have been multiple reports of this ...

Trying to set/change an element of a fixed-size TAssetPtr array in the Editor results in a crash.

Trying to set the value of an element of a fixed-size TAssetPtr array in the Editor results in the Editor crashing. This did not occur in 4.13. The attached callstack is from debugging the project ...