Unreal Engine Issues
Unreal Engine Issues
Adding widget to viewport on code overlap event causes the editor to crash when opening child blueprint
UE - Editor - UI Systems - Oct 30, 2015Setting a UMG widget to be added to viewport when a volume is overlapped though code and creating a blueprint of this class causes the editor to crash when the blueprint is opened if the BP has a st ...
Swapping between Multiple Cloth Skeletal Meshes and Animation Classes in a Character Blueprint causes the Engine to crash
UE - Simulation - Physics - Aug 2, 2018When changing Cloth Skeletal Meshes and Animation Blueprints on a Character it will cause the Engine to crash during PIE. This is a regression from 4.19.2 (CL-4033788) as it was working as expected ...
Crash during .zfprj import when Feature detection quality is set to High and Use mosaic images as feature source is set to Yes
RS - Alignment - Dec 19, 2025Found in 2.0.0.118621 (R200). It appears that the combination of Feature detection - High and Use mosaic images as feature source during .zfprj LiDAR import - Yes. causes a crash. Outcome: RS ...
Crash occurs in Hierarchical Instanced Static Mesh of Mesh with MinLOD set to 1 or higher
UE - Graphics Features - Oct 22, 2020I have attached a reproduction project with the above settings.[Link Removed] It crashes when packaged, launched and moved in-game. This issue seems to occur when there is an object in the Unbuilt ...
Recompiling an ABP that another ABP has a Property Access dependency on without recompiling/linking the other causes a crash
UE - Anim - Runtime - Anim Blueprints - Oct 2, 2025The crash comes from the pointers in FAnimSubsystem_PropertyAccess::Library::Indirections in the layer ABP from pointing to old/invalid functions and properties from the trash ABP_Manny, as they hav ...
Shortcut(Function, Add a new function graph) leads to crash in the MacroLibrary editor.
UE - Gameplay - Blueprint Editor - Dec 4, 2017Shortcut will still led to create a new function in the macro library. and this makes engine crash with following callstack. Assertion failed: Blueprint->BlueprintType != BPTYPE_MacroLibrary [Link ...
Adding pin to CR node causes crash if input variable is assigned to one of the array element
UE - Anim - Rigging - Control Rig - Aug 22, 2025When a node has a variable assigned to one of its pins. You will get a crash every time you add a pin. I am sure this goes for all nodes with with the "add pin" functionality [Link Removed] ...
Crash launching project with Compat.MAX_GPUSKIN_BONES=75 and Preview Rendering set to Shader Model 5
UE - Graphics Features - Oct 18, 2018Crash occurs when the user launches a project with a +75 bone skeletal mesh actor in their scene with the Compat.MAX_GPUSKIN_BONES=75 config change, and the default preview render is Shader Model 5. ...
Crash When Changing to Landscape Paint Tool With a Material Function for the World Position Offset of the Landscape Material
UE - Graphics Features - Feb 25, 2019Crash on switching to landscape/paint tab when using a landscape material that has a material function hooked onto the WorldPositionOffset. Working as expected in 4.21 CL# 4753647 Found in 4.22 CL ...
Crash compiling Widget Blueprints that contain Dynamic Entry Boxes with their Entry Widget Class set to each other
UE - Editor - UI Systems - Jun 10, 2020Currently the Dynamic Entry Box has no protection against recursion, leading to a stack overflow and a crash. This issue was reported and tested in 4.25 (CL-13144385). This was reproduced in 4.24.3 ...