Unreal Engine Issues
Unreal Engine Issues
Server crashes when client connects after Server has reloaded a sublevel with a deleted actor
UE - Networking - Jul 13, 2017UNetDriver::DestroyedStartupOrDormantActors maintains a list of deleted startup (and dormant) actors. This is used to notify clients that have joined the server of Actors that need to be destroyed ...
"Support Compute Skincache" throws an Assert for games on Linux
UE - Graphics Features - Apr 16, 2019After enabling "Support Compute Skincache" in the project settings and packaging a game on Linux, the packaged game will throw an assert. Any setting that turns "Support Compute Skincache" on automa ...
Out-of-Bounds Access During Partial Updates of ISMC Per-Instance Custom Data
UE - Graphics Features - Jan 6, 2026When using instance custom data values, removing an instance and changing the number of custom data floats in sequence can cause an array-out-of-bounds crash. The underlying arrays are not resized ...
Sequential Level Loading in Python causes Crash
UE - Editor - Workflow Systems - Apr 16, 2019Loading all the levels selected in the Content Browser and running the aforementioned Python script causes the editor to crash Tested in 4.20.3 (CL - 4369336), 4.21.2 (CL - 4753647), 4.22 (CL - 5 ...
Client crash on seamless travel in DataReplication with lag
UE - Networking - Jan 11, 2016When server traveling, client may crash due to lag while attempting to replicate object/property. ...
Virtual Bone caused nanite skinned mesh crash
UE - Graphics Features - Nanite - May 31, 2025When a Nanite skeletal mesh has a virtual bone the engine can crash when changing LODs ...
Assertion failed: PlatformNeedsExtraDeletionLatency()
UE - Rendering - Architecture - RHI - Mar 5, 2019Animating a HISM along a spline when many other HISMs are present will result in a crash in 4.22. Confirmed in 4.23 MAIN @ CL 5291468 ...
nDisplay - UMG widgets sync
UE - Virtual Production - nDisplay - Nov 9, 2019As soon as the widget was visible on the node/display at least once all nodes/displays receive the button press and correctly increase the counter. Therefore it seems like the widgets are only initi ...
Mover | FStanceModifier adjustment teleport on Crouch/Uncrouch can fail when child components intersect world
UE - Gameplay - Player Movement - Mover - Feb 3, 2026Context When crouching and uncrouching with Mover’s DefaultMovementSet, the pawn capsule’s half height is changed. This behavior mimics the CharacterMovementComponent. To ensure the pawn’s feet sta ...
Crash when deleting the Add Component By Class node after changing the Relative Transform of the component
UE - Gameplay - Blueprint - Mar 31, 2021When adding the Add Component By Class node, choosing a class that has a Relative Transform pin, changing the transform, and deleting the node the editor crashes. I tested this with the Skeletal Mes ...