Unreal Engine Issues
Unreal Engine Issues
OnRep functions do not fire on the Server when elements are added to an array variable marked as RepNotify
UE - Networking - Mar 17, 2015OnRep functions do not fire on the Server when elements are added to an array variable marked as RepNotify. They do not fire at all when setting an array element with the Set Array Elem node. Proba ...
Remove Item Node Removes All Objects in an Array
UE - Gameplay - Blueprint - Nov 9, 2015Getting an object from an array at a certain index and then using the Remove Item node causes the entire array to be wiped. Found in 4.10 Preview 4. Reproduced in 4.9.2 binary and Main CL 2752291. ...
Crash when moving/copying Blueprints folder into another folder
Tools - Jan 4, 2017The editor crashes when the blueprints folder is moved into another folder in the sources panel This crash is similar to UE-34388 But have different callstacks. This is a Regression from 4.14.2 ...
Setting a value Material Parameter Collection to Material will cause crash
UE - Graphics Features - May 2, 2016Adding a Material Parameter collection to a material, setting its value, then saving the material will cause a crash. This was only able to be reproduced on Mac and did not affect the Windows versio ...
Sublevel moves away when undoing the level visibility change
Tools - Nov 21, 2016When you have a sub level with some level transform, changing its visibility then doing undo makes the sub level moved away as if the level transform applied twice. I could repro the issue in 4.13. ...
Applying downscale causes textures to display unexpectedly on widgets
UE - Editor - UI Systems - Slate - Sep 22, 2025When applying downScale 2.0 to UI textures to reduce resolution, unintended display issues occur on widgets, such as: ・The border of box-shaped Widgets with DrawAs set to “Box” becomes thinner ・Dot ...
Docking tabs to the main viewport will hide other viewports that are not docked
UE - Editor - UI Systems - Slate - Mar 3, 2015If any tabs are undocked from the main viewport and another tab is then docked to the main viewport it will hide any undocked tabs. This only appears to affect tabs that in the Menu > Window with ex ...
Compiling any material in UE 5.5.1 without ShaderCompiler JobCache results in a crash
UE - Rendering Architecture - Shaders - Jan 15, 2025Compiling any material with r.ShaderCompiler.JobCache=0 causes ShaderCompileWorker to crash. Reproduction steps cause a crash during Editor startup, but this bug may affect other scenarios where mat ...
Gameplay Debugger Won't Open When Using US International Keyboard Settings
UE - Gameplay - Input - Nov 23, 2015Using a keyboard with US International settings prevents the gameplay debugger from being opened when using the apostrophe key. Potentially a similar issue to [Link Removed]. Found in 4.10 binary. ...
NavLink component does not account for the cost of the path set by AreaClass
UE - AI - Sep 6, 2018In the test case, the NavLink component has a navigation cost of 1000000000. When the AI navigates to the NavLink the printed cost is only 2677. It is believed that the AreaClass isn't being taken i ...