Unreal Engine Issues
Unreal Engine Issues
PIE also rendering in-active / unfocused editor viewport
UE - Rendering - Graphics Features - Nov 28, 2025In 5.8, after entering PIE, the editor will start doing two SceneRenders per frame. This dramatically drops performance. Presumably this second render is for the inactive / unfocused editor viewport ...
Adjusting color picker value for color structs within a structure crashes editor
UE - Gameplay - Blueprint - Aug 1, 2016Attempting to adjust the value of a color struct via the color picker in structures crashes the editor. Frequency: 3/3 CrashReporter: [Link Removed] Regression (Yes) issue (does not) occur in 4. ...
Setting color in linear color struct variable within another struct crashes the editor
UE - Gameplay - Blueprint - Jun 16, 2016Setting color in linear color struct variable within another struct crashes the editor. Frequency: 4/4 Regression (yes) issue (does not) occur in 4.11.2 ...
Material Editor Assertion Crash When Collapsing Material Attributes
UE - Rendering - Architecture - Materials - Jul 14, 2022Collapsed material attribute nodes cause an editor assertion crash in the material editor when viewed or opened. Assertion failed: (Index >= 0) & (Index < ArrayNum): Array index out of bounds: 0 fr ...
Opening blueprint debugger crashes editor
UE - Gameplay - Blueprint - Apr 29, 2016The editor crashes upon attempting to open the blueprint debugger through the Window menu. Frequency: 2/2 Regression (Yes) issue (does not) occur in 4.11.2 ...
Editor crashes while saving or closing after heightmap import
UE - LD & Modeling - Terrain - Landscape - Aug 5, 2016Editor crashes while attempting to save or close project after importing a landscape from a heightmap. Frequency: 2/2 Crashreporter: [Link Removed] Regression (yes) issue (does not) occur in 4.1 ...
Niagara module "Beam Emitter Setup" makes attribute Emitter.BeamID flick between -1 and LoopCount every frame
UE - Niagara - Mar 6, 2026When working with beam and ribbon effects in Niagara, Emitter.BeamID is used to fill Particles.RibbonID so that a looping emitter can spawn multiple discrete beams. Emitter.BeamID is assigned by mod ...
Importing Camera FBX into a sequence can crash with a headless editor
UE - Anim - Sequencer - Mar 19, 2021In a headless editor instance we will not be able to send toasts to the user, and we should not notify slate. The Sequencer Tools function library calls MovieSceneToolHelpers::ImportFBXCameraToExist ...
When using simple HMD plugin on mobile the camera can get stuck at 45 -90 angle even though the device it back in it's original position
UE - Platform - XR - Jan 19, 2016If the user uses the simple HMD plug in, then launches on to a device and then follow up by spinning the device a few time the camera will become offset at an odd angle (Reset orientation and positi ...
WindDirectionalSourceComponent needs functions like, 'SetSpeed'
UE - Graphics Features - Oct 22, 2015Currently changing variables like Speed via BP/C++ has no affect. We need to add funcs like SetSpeed that also update the proxy. Would be nice to make the vars private as well. ...