Unreal Engine Issues
Unreal Engine Issues
[CrashReport] Mac crash - FCocoaRunLoopSource::Process
UE - Platform - Apple - Sep 14, 2017This is a somewhat common Mac crash that has occurred since at least 4.14 and into 4.17. Users have not provided any descriptions of their actions when the crash occurred. The callstack contains l ...
[CrashReport] Crash related to refreshing Destructible Mesh - SaveExistingSkelMeshData()
UE - Simulation - Physics - Destruction - Jul 20, 2017This is a common crash affecting users in 4.16. User DescriptionsPressing the button to restart the basic mesh in the destruction editor causes the crash.Refreshing a Destructible Mesh that has had ...
New VR-Basic level triggers Metal validation layer assertion
UE - Platform - Apple - Mar 16, 2020This was discovered externally and reported on UDN here: https://udn.unrealengine.com/questions/563268/mac-editor-crash-when-disable-ambient-occlusion.html ...
'Missing Receipt' error after disabling plugin in binary build and repackaging
UE - Foundation - Cpp Tools - Oct 18, 2018This was originally found with Android Launch On but also occurs Launching on to Windows with a new project. This will not reproduce when using a build from PerforceogPlayLevel: Setting up ProjectP ...
Project breaks if Online Subsystem plugin is disabled
UE - Foundation - Core - Apr 25, 2017Disabling Online Subsystem prevents the project from loading. On Windows, this produces an error shown in attached screenshot. On Linux, this causes a crash with the attached callstack on project ...
Third Person Character Package imports with linker errors
UE - Platform - XR - Oct 19, 2020I was able to encounter these errors on the latest binary for 4.25.3 when doing a repro for a salesforce ticket. Here is the customers description:When importing the C++ ThirdPersonCharacter package ...
[CrashReport] Access Violation - UModelComponent::GetPhysicsTriMeshData() [modelcomponent.cpp:673]
UE - Simulation - Physics - Oct 2, 2017This is a trending crash coming out of the 4.18 Previews. Users have not provided any descriptions of their actions when the crash occurred. The callstack is similar to [Link Removed], which was ju ...
In a Geometry Collection, enabling Nanite Fallback in a Nanite Enabled collection won't generate a Physics Body when Nanite is disabled
UE - Simulation - Physics - Destruction - Jun 30, 2025In a Geometry Collection, enabling Nanite Fallback in a Nanite Enabled collection won't generate a Physics Body when Nanite is disabled. To verify this, follow the steps provided in the Steps to Re ...
D3D12 Does Not Correctly Validate Static Uniform Buffers Correctly
UE - Rendering Architecture - RHI - Feb 12, 2025When adding a Uniform Buffer Struct that has one 4x4 matrix to a mesh pass, validation will fail, due to a Uniform Buffer Struct mismatch. This can be reproduced by adding a mesh pass in project-si ...
Structs cause packaging to fail when Blueprint Nativization Method is set to "Inclusive"
UE - Gameplay - Blueprint - Apr 26, 2017Structs cause packaging to fail when Blueprint Nativization Method is set to "Inclusive" Note: Appears to be a regression (worked in 4.15.1) Error example: UATHelper: Packaging (Windows (64-bit)) ...