Unreal Engine Issues
Unreal Engine Issues
Crash when changing a Play Node's "Sequence" to a Montage
OLD - Anim - Jan 20, 2016I understand that this is not something you're intended to be able to do (Montages aren't used this way), but we should bar the user from inserting a montage into this variable slot. Crash occurs w ...
Crash when building lighting while in PIE
UE - Graphics Features - Feb 21, 2017NOTE: This issue is similar to (same callstack) as [Link Removed], however this issue is still occurring in 4.15.0. Error Message: Access violation - code c0000005 (first/second chance not availab ...
Using a Macro to access a variable from another Actor causes a crash in Standalone
UE - Gameplay - Blueprint - Jun 8, 2015Using a Macro to access a variable from another Actor causes a crash in Standalone. This does not seem to affect any other preview in editor, nor packaged games. Reproduced in 4.7.6, 4.8 Preview 4, ...
Niagara Scalability Crash When Processing Significance
UE - Niagara - Jun 4, 2025Method FNiagaraScalabilityManager::ProcessSignificance() iterates on indices from Context.SignificanceIndices and uses them to access the State and ManagedComponents arrays. It can then decide to cr ...
World Source in Take Recorder does not record auto-tracked actors properly
UE - Virtual Production - Tools - Take Recorder - May 23, 2025The Take Recorder plugin allows for multiple sources to be recorded during gameplay. The World Source is expected to record everything in the level when the Autotrack Actors option is enabled. Once ...
Bloated instruction counts in the material editor causing long compiles
UE - Graphics Features - Apr 17, 2019artists are dealing with greatly increased iteration times due to long shader compiles when working in the material editor. This has regressed over time as we add more features to the point were wor ...
Blueprint macro in a level blueprint causes memory leak
UE - Gameplay - Blueprint - Oct 15, 2019The level blueprint has a macro that references a level. FBlueprintNodeTemplateCache keeps holding this cashe at transition level. Unable to find source-code formatter for language: text. Available ...
Crash after adding Virtual Bone, then Creating Asset
OLD - Anim - Jul 5, 2017Occurs on? 4.16 - 3466753 - YES 4.17 - 3521650 - YES Error message: Assertion failed: RefBonePose.Num() == NumBones [Link Removed] [Line: 4400] Source Context:4387 ResetAnimation(); 4388 ...
LIVE: Changing a Custom Event to Multicast in a parent blueprint causes crash
UE - Gameplay - Blueprint - Nov 13, 2014Changing a Custom Event to Multicast in a parent blueprint causes crash if the Custom Event is being used in the child blueprint. Callstack: MachineId:DE189244480D3CD0F8CA729A02DD38A6 UserName:tjb ...
[CrashReport] Mac/Metal crash - Assertion failed: (PixelShader->Bindings.InOutMask
UE - Graphics Features - Nov 10, 2017This is a low frequency but trending crash coming out of 4.18. User DescriptionsAttempting to open a copied/converted from 4.16.3 project on 4.18 preview 4. Problem arose after preview 3. Was able ...