Unreal Engine Issues
Unreal Engine Issues
Capturing backtrace of another thread in engine built with clang raises access violation exception
UE - CoreTech - Jan 11, 2024Engine built with Clang throws an exception when calling RtlVirtualUnwind with a different thread ID. Engines built with Microsoft compilers do not occur this problem. For example, if starting PI ...
UE5.6+ - Mutable - IDPrefix crash when combining Child Objects, Add to Mesh Component and Extend Mesh Section.
UE - Anim - Mutable - Jul 21, 2025So the issue seems to be a combination of Add To Mesh Component and Extend Mesh Section. I've tried this in Epic Launcher 5.6, 5.6 in-house modified engine as well as ue5-main 5.7 from git (editor ...
Crash when calling SetVector2DParameter on a Niagara Parameter Collection
UE - Niagara - Mar 10, 2022Crash when calling SetVector2DParameter on a Niagara Parameter Collection. The value for the SetVector2DParameter may or may not have to be changed in order for the crash to occur. Assertion faile ...
GetOverlappingComponents does not work on Mobile
UE - Simulation - Physics - Jun 13, 2016The GetOverlappingComponents node isn't working correctly on mobile devices. It seems like it may only not be registering components that are spawned at runtime, as it does change the number of over ...
Media Player assets do not play in packaged games or in standalone
Tools - Mar 8, 2016Media Players and their associated textures do not render in standalone game or in a packaged project. Found on: //UE4/Release-4.11 CL-2897738 Checked 4.9.2 Binary from launcher, issue occurs ther ...
Exiting VR Edit mode from simulating causes viewport mismatch
UE - Editor - Workflow Systems - Mar 5, 20169/19 VREditor sync notes: Should grey out the editor button while you're simulating ----------------------------------------- I noticed you can fix this issue by reseting the viewport by pressing t ...
Motion Blur has noticeable Artifacts when rotating Camera
UE - Graphics Features - Aug 26, 2016When rotating a camera about an actor the motion blur starts to create blocky/pixelated artifacts around the character in a halo. This can be further exaggerated by moving the actor while rotating t ...
Setting animbp reference variable in construction script creates additional animbp reference if simulating
UE - Gameplay - Blueprint - May 24, 2016If a reference to the animBP is set in the construction script of an actor, simulating will show two separate instances of the animBP instead of one. Setting this on Event Begin Play does not produc ...
Placing a Physics Constraint Component in an Actor Triggers a Warning During PIE When There Are No Constrained Components
UE - Simulation - Physics - May 15, 2017A warning is appearing in the output log during PIE when an actor contains a Physics Constraint component that does not have any constrained components set. This did not occur in 4.15.2, this is a ...
Cannot add to Override Materials array of a Static Mesh Component
UE - Graphics Features - May 23, 2017Materials cannot be added to the Override Materials array in a static mesh component because attempting to add elements to the array fails. Regression: Yes - using the plus button to add to the arr ...