# \#reproducible-bug **URL:** https://forums.unrealengine.com/tag/reproducible-bug/10320.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [On Mouse Button Double Click Bug](https://forums.unrealengine.com/t/on-mouse-button-double-click-bug/403092)
**Author:** [@anonymous\_user\_3115cf58](https://forums.unrealengine.com/u/anonymous_user_3115cf58)\ **Replies:** 36\ **Last updated:** [March 22, 2026, 4:35pm UTC](https://forums.unrealengine.com/t/on-mouse-button-double-click-bug/403092 "2026-03-22T16:35:33Z")
When you try and override the on mouse double click event on a widget button and use the left mouse button to trigger the logic within that event, during play double left clicking on the widget button does nothing. Howev… --- ## [Filter in "My Library" has unexpected behavior](https://forums.unrealengine.com/t/filter-in-my-library-has-unexpected-behavior/2151883)
**Author:** [@Bumber92](https://forums.unrealengine.com/u/Bumber92)\ **Replies:** 1\ **Last updated:** [November 17, 2025, 10:59pm UTC](https://forums.unrealengine.com/t/filter-in-my-library-has-unexpected-behavior/2151883 "2025-11-17T22:59:32Z")
Summary My latest order of 30 items is only displayed partially in “My Library”. The API seems to return not the entire list or the UI is processing the result incorrectly. On each page refresh there are only 24 items o… --- ## ["...has to have 'Physics Enabled' if you'd like to GetMass" not true!](https://forums.unrealengine.com/t/has-to-have-physics-enabled-if-youd-like-to-getmass-not-true/408368)
**Author:** [@VictorBurgos](https://forums.unrealengine.com/u/VictorBurgos)\ **Replies:** 4\ **Last updated:** [March 24, 2024, 1:06pm UTC](https://forums.unrealengine.com/t/has-to-have-physics-enabled-if-youd-like-to-getmass-not-true/408368 "2024-03-24T13:06:31Z")
Well, I’m not even sure what the bug is really. It’s either the warning or it’s that we’re not supposed to be getting GetMass from an unenabled physics object. Even without enabling physics on a static mesh object, you c… --- ## [Mounted turrets and armored walls on stairs are buggy](https://forums.unrealengine.com/t/mounted-turrets-and-armored-walls-on-stairs-are-buggy/828153)
**Author:** [@DeviousDinero](https://forums.unrealengine.com/u/DeviousDinero)\ **Replies:** 0\ **Last updated:** [March 27, 2023, 5:24pm UTC](https://forums.unrealengine.com/t/mounted-turrets-and-armored-walls-on-stairs-are-buggy/828153 "2023-03-27T17:24:34Z")
Mounted turrets aren’t working as expected. When I add them to my island from regular creative, I can’t launch session because i get the “found disallowed object type” error. When I add them from UEFN, I’m not allowed to… --- ## [\[BUG\] UMG MouseButtonUp event only triggers on double click](https://forums.unrealengine.com/t/bug-umg-mousebuttonup-event-only-triggers-on-double-click/411160)
**Author:** [@birdfreeyahoo](https://forums.unrealengine.com/u/birdfreeyahoo)\ **Replies:** 6\ **Last updated:** [March 16, 2022, 6:59am UTC](https://forums.unrealengine.com/t/bug-umg-mousebuttonup-event-only-triggers-on-double-click/411160 "2022-03-16T06:59:17Z")
I discovered the following bug while working with UMG in 4.18.1: You can reproduce it by following these steps: Create a new Blank Project without Starter Content Create Custom Game Mode and Pawn Blueprints. In World S… --- ## [UE-135158 is a current bug?](https://forums.unrealengine.com/t/ue-135158-is-a-current-bug/491553)
**Author:** [@Cpt\_Atoom](https://forums.unrealengine.com/u/Cpt_Atoom)\ **Replies:** 1\ **Last updated:** [December 6, 2021, 2:20pm UTC](https://forums.unrealengine.com/t/ue-135158-is-a-current-bug/491553 "2021-12-06T14:20:36Z")
UE-135158 is a reported issue resolved as “Cannot Reproduce”. But I have the same problem with the exact same way to reproduce it. So if it’s not a bug I assuming that my blueprint is the problem but i only created a ble… --- ## [CreateWidget Bug - exposed property pins NULL on OnInitialized, useless.](https://forums.unrealengine.com/t/createwidget-bug-exposed-property-pins-null-on-oninitialized-useless/489579)
**Author:** [@Roy\_Wierer.Seda145](https://forums.unrealengine.com/u/Roy_Wierer.Seda145)\ **Replies:** 1\ **Last updated:** [October 10, 2021, 2:54pm UTC](https://forums.unrealengine.com/t/createwidget-bug-exposed-property-pins-null-on-oninitialized-useless/489579 "2021-10-10T14:54:16Z")
To reproduce bug: Create a widget, add an actor property and expose it. Spawn the widget by using the BP node CreateWidget, link an actor reference to the exposed property pin. Inside the widget, on the only event fit… --- ## [Bug Movie Queue Rendering? Hidden objects turned on in rendering (UE 4.26.2 Windows 10)](https://forums.unrealengine.com/t/bug-movie-queue-rendering-hidden-objects-turned-on-in-rendering-ue-4-26-2-windows-10/482521)
**Author:** [@Alexyz31](https://forums.unrealengine.com/u/Alexyz31)\ **Replies:** 1\ **Last updated:** [May 12, 2021, 6:35pm UTC](https://forums.unrealengine.com/t/bug-movie-queue-rendering-hidden-objects-turned-on-in-rendering-ue-4-26-2-windows-10/482521 "2021-05-12T18:35:00Z")
Hello, I have just updated today to UE 4.26.2 and now hidden (invisible) objects were rendered in Movie Render Queue. They also show unwanted up, when I’m pressing PLAY I reproduced the issue with the ArchViz template… --- ## [AudioVolume can't change interior settings at runtime](https://forums.unrealengine.com/t/audiovolume-cant-change-interior-settings-at-runtime/482213)
**Author:** [@KazemAkhgary](https://forums.unrealengine.com/u/KazemAkhgary)\ **Replies:** 1\ **Last updated:** [April 20, 2021, 3:32pm UTC](https://forums.unrealengine.com/t/audiovolume-cant-change-interior-settings-at-runtime/482213 "2021-04-20T15:32:22Z")
Changing Exterior settings at runtime works fine. namely ExteriorVolume and ExteriorLPF. how ever changing Interior settings at runtime has no effect. namely InteriorVolume and InteriorLPF. I have tested this on a fres… --- ## [GetTransformAtDistanceAlongSpline issue](https://forums.unrealengine.com/t/gettransformatdistancealongspline-issue/460094)
**Author:** [@Pocitaci](https://forums.unrealengine.com/u/Pocitaci)\ **Replies:** 2\ **Last updated:** [April 15, 2021, 8:30am UTC](https://forums.unrealengine.com/t/gettransformatdistancealongspline-issue/460094 "2021-04-15T08:30:49Z")
Hi, I’d like to make a static mesh to move along a spline component in an Actor BP and found that using GetTransformAtDistanceAlongSpline node won’t let the meshes to move “smoothly”. It flutters slightly rather than m… --- ## [Slight camera vibration with set relative location](https://forums.unrealengine.com/t/slight-camera-vibration-with-set-relative-location/475147)
**Author:** [@GraninMG](https://forums.unrealengine.com/u/GraninMG)\ **Replies:** 0\ **Last updated:** [November 30, 2020, 7:01am UTC](https://forums.unrealengine.com/t/slight-camera-vibration-with-set-relative-location/475147 "2020-11-30T07:01:22Z")
Hi there ! I have a really strange bug (?) or maybe I’m missing something… You can reproduce that in a new third person template. You just have to set the relative location of camera boom like that: Then, when rota… --- ## [Particle Systems Don't Play In Reopened Levels With ES 3.1 Enabled](https://forums.unrealengine.com/t/particle-systems-dont-play-in-reopened-levels-with-es-3-1-enabled/465516)
**Author:** [@anonymous\_user\_3e102909](https://forums.unrealengine.com/u/anonymous_user_3e102909)\ **Replies:** 0\ **Last updated:** [May 20, 2020, 12:26pm UTC](https://forums.unrealengine.com/t/particle-systems-dont-play-in-reopened-levels-with-es-3-1-enabled/465516 "2020-05-20T12:26:42Z")
I have report this issue in UE-87537. The feedback is that It cannot reproduce. But I try to the followed steps and it reproduce(UE4.25). The issue is reproduced in both editors that i use source code to build or get fro… --- ## [Bug - Lightmap Density Crashes with DX12](https://forums.unrealengine.com/t/bug-lightmap-density-crashes-with-dx12/461994)
**Author:** [@Sotalo](https://forums.unrealengine.com/u/Sotalo)\ **Replies:** 1\ **Last updated:** [March 4, 2020, 9:14pm UTC](https://forums.unrealengine.com/t/bug-lightmap-density-crashes-with-dx12/461994 "2020-03-04T21:14:26Z")
This bug has been around for the last few engine versions, but I realized switching to lightmap density view mode crashes every time I run my project with DX12 RHI. Switching back to DX11 seems to resolve the issue. I th… --- ## [Material Custom node makes Editor crush (UE4.23.0)](https://forums.unrealengine.com/t/material-custom-node-makes-editor-crush-ue4-23-0/457096)
**Author:** [@rincom](https://forums.unrealengine.com/u/rincom)\ **Replies:** 1\ **Last updated:** [October 18, 2019, 4:50pm UTC](https://forums.unrealengine.com/t/material-custom-node-makes-editor-crush-ue4-23-0/457096 "2019-10-18T16:50:46Z")
Hi there! Working in UE4.23.0 i met a bug. In case when Material Editor custom node has more than 6-7 inputs, and i try to edit something in there, UE editor crashes. It is constant bug, and can be reproduced easily on… --- ## [Ownership/Role issue on possession switch (player-\>AI) in networked game](https://forums.unrealengine.com/t/ownership-role-issue-on-possession-switch-player-ai-in-networked-game/442029)
**Author:** [@Shempii](https://forums.unrealengine.com/u/Shempii)\ **Replies:** 2\ **Last updated:** [August 22, 2019, 9:55pm UTC](https://forums.unrealengine.com/t/ownership-role-issue-on-possession-switch-player-ai-in-networked-game/442029 "2019-08-22T21:55:28Z")
My team and I have encountered a very specific bug that has to do with switching pawn possession with a playercontroller and an AIcontroller in a networked game. Our case: During a networked game, we allow a player to b… --- ## [Can't save MaterialInstanceDynamic created via C++](https://forums.unrealengine.com/t/cant-save-materialinstancedynamic-created-via-c/451988)
**Author:** [@anonymous\_user\_a4ea03db1](https://forums.unrealengine.com/u/anonymous_user_a4ea03db1)\ **Replies:** 8\ **Last updated:** [July 12, 2019, 3:39am UTC](https://forums.unrealengine.com/t/cant-save-materialinstancedynamic-created-via-c/451988 "2019-07-12T03:39:57Z")
Can’t save D:/Documents/Programming/Unreal/DMI\_Bug/Content/MyMap.umap: Graph is linked to private object(s) in an external package. External Object(s): MaterialInstanceDynamic\_0 Try to find the chain of references to … --- ## [ThirdPersonCharacter blueprint always replicates even when breplicates is set to false](https://forums.unrealengine.com/t/thirdpersoncharacter-blueprint-always-replicates-even-when-breplicates-is-set-to-false/451665)
**Author:** [@SHADESPIRIT](https://forums.unrealengine.com/u/SHADESPIRIT)\ **Replies:** 5\ **Last updated:** [July 3, 2019, 10:32pm UTC](https://forums.unrealengine.com/t/thirdpersoncharacter-blueprint-always-replicates-even-when-breplicates-is-set-to-false/451665 "2019-07-03T22:32:41Z")
So all you need to do to reproduce the issue (4.22) is to call a spawnActorFromClass (I did it inside the gameMode) while having ‘breplicates’ ‘unchecked’. Tried this with the FirstPersonCharacter and has no problems, ju… --- ## [Issue with Tileset View selection with Mouse Location](https://forums.unrealengine.com/t/issue-with-tileset-view-selection-with-mouse-location/416790)
**Author:** [@anonymous\_user\_5fada9eb](https://forums.unrealengine.com/u/anonymous_user_5fada9eb)\ **Replies:** 8\ **Last updated:** [June 21, 2019, 1:33pm UTC](https://forums.unrealengine.com/t/issue-with-tileset-view-selection-with-mouse-location/416790 "2019-06-21T13:33:46Z")
when using the “Tile Set View” and trying to select tiles, the mouse clicks that are registered are really far off from where I’m clicking on the screen. I’ve been able to reproduce this by creating a new project and ti… --- ## [Crash while unhiding streaming level in multiplayer](https://forums.unrealengine.com/t/crash-while-unhiding-streaming-level-in-multiplayer/402724)
**Author:** [@Curs0](https://forums.unrealengine.com/u/Curs0)\ **Replies:** 12\ **Last updated:** [April 2, 2019, 9:19am UTC](https://forums.unrealengine.com/t/crash-while-unhiding-streaming-level-in-multiplayer/402724 "2019-04-02T09:19:01Z")
I’ve already posted this issue a few months ago: we were supposing to had found a solution but the problem still here. I was able to reproduce the crash in 4.16 and 4.17 as well: here is test project (test project from… --- ## [UE-48038 corrupt map left turn bug](https://forums.unrealengine.com/t/ue-48038-corrupt-map-left-turn-bug/445438)
**Author:** [@Aikirob](https://forums.unrealengine.com/u/Aikirob)\ **Replies:** 0\ **Last updated:** [March 17, 2019, 12:15am UTC](https://forums.unrealengine.com/t/ue-48038-corrupt-map-left-turn-bug/445438 "2019-03-17T00:15:16Z")
unreal engine has a bug where a corrupt map will crash the engine when turning left in the editor, the only solution is to make a new map and migrate everything over, copy-paste or duplicating reproduces the bug, so you … --- ## [The default value of a variable promoted to a variable is always 0](https://forums.unrealengine.com/t/the-default-value-of-a-variable-promoted-to-a-variable-is-always-0/443460)
**Author:** [@LyuroCN](https://forums.unrealengine.com/u/LyuroCN)\ **Replies:** 0\ **Last updated:** [February 15, 2019, 2:29pm UTC](https://forums.unrealengine.com/t/the-default-value-of-a-variable-promoted-to-a-variable-is-always-0/443460 "2019-02-15T14:29:39Z")
Steps to reproduce the bug \*\* : 1, Promoted to a variable from any note 2, Modify the default values 3, Compile , Watch this value 4, Play the game Problem: Default Value have been set. But \[Watch this value\] displ… --- ## [Some sort of "tearing" visible when running ParticleEffects Demo with Vulkan](https://forums.unrealengine.com/t/some-sort-of-tearing-visible-when-running-particleeffects-demo-with-vulkan/437984)
**Author:** [@John\_Alcatraz](https://forums.unrealengine.com/u/John_Alcatraz)\ **Replies:** 6\ **Last updated:** [November 20, 2018, 8:32pm UTC](https://forums.unrealengine.com/t/some-sort-of-tearing-visible-when-running-particleeffects-demo-with-vulkan/437984 "2018-11-20T20:32:11Z")
I’ve looked at the particle effects demo with Vulkan in 4.21, and I have not done any performance testing, I only packaged the demo in Shipping config with D3D11 and Vulkan APIs enabled, and then compared how it feels to… --- ## [Blueprint function returning wrong value](https://forums.unrealengine.com/t/blueprint-function-returning-wrong-value/437680)
**Author:** [@HEGI](https://forums.unrealengine.com/u/HEGI)\ **Replies:** 8\ **Last updated:** [November 15, 2018, 3:06pm UTC](https://forums.unrealengine.com/t/blueprint-function-returning-wrong-value/437680 "2018-11-15T15:06:26Z")
Hello, I have a pure blueprint function that returns a value based on a simple condition. Now when the condition is not met anymore and the function has no return node, the last valid path is returned. In the case o… --- ## [UE-51608 still reproducible win10 in 4.20.3](https://forums.unrealengine.com/t/ue-51608-still-reproducible-win10-in-4-20-3/436350)
**Author:** [@anonymous\_user\_16e7140f](https://forums.unrealengine.com/u/anonymous_user_16e7140f)\ **Replies:** 0\ **Last updated:** [October 25, 2018, 5:07pm UTC](https://forums.unrealengine.com/t/ue-51608-still-reproducible-win10-in-4-20-3/436350 "2018-10-25T17:07:37Z")
Hello, I am still able to reproduce the bug mentioned in Unreal Engine Issues and Bug Tracker (UE-51608) in UE v4.20.3 (installed from Epic Games launcher) under Windows 10 and Visual Studio 2017 v15.8.8 - just had a ne… --- ## [How to fix a custom software cursor placement for high dpi monitor in PIE?](https://forums.unrealengine.com/t/how-to-fix-a-custom-software-cursor-placement-for-high-dpi-monitor-in-pie/435346)
**Author:** [@NorlinGames](https://forums.unrealengine.com/u/NorlinGames)\ **Replies:** 1\ **Last updated:** [October 10, 2018, 11:19am UTC](https://forums.unrealengine.com/t/how-to-fix-a-custom-software-cursor-placement-for-high-dpi-monitor-in-pie/435346 "2018-10-10T11:19:18Z")
When I’m trying to use a custom software cursor (with an UMG widget), it’s placed wrong in PIE mode (either inside the editor or in a new window). Please look for the screenshot (it’s a “Run in a new window” option, not… --- ## [Hot reload blueprint reinstancing issue](https://forums.unrealengine.com/t/hot-reload-blueprint-reinstancing-issue/396196)
**Author:** [@anonymous\_user\_c5d5991f](https://forums.unrealengine.com/u/anonymous_user_c5d5991f)\ **Replies:** 3\ **Last updated:** [September 21, 2018, 7:42pm UTC](https://forums.unrealengine.com/t/hot-reload-blueprint-reinstancing-issue/396196 "2018-09-21T19:42:11Z")
I’ve found a bug on 4.16 that seems to be a regression with relation to hot reload. These are the steps to reproduce it: Create an empty C++ project Create in C++ a UCLASS that extends APlayerController Create in C++ a… --- ## [AnimGraphNode\_SkeletalControlBase is returning nullptr for in UE 4.20](https://forums.unrealengine.com/t/animgraphnode-skeletalcontrolbase-is-returning-nullptr-for-in-ue-4-20/430126)
**Author:** [@codehawk64](https://forums.unrealengine.com/u/codehawk64)\ **Replies:** 6\ **Last updated:** [September 18, 2018, 11:25pm UTC](https://forums.unrealengine.com/t/animgraphnode-skeletalcontrolbase-is-returning-nullptr-for-in-ue-4-20/430126 "2018-09-18T23:25:53Z")
\]\[1\] The above crash states LowLevelFatalError on skeletalControlBase.h at line 164 at the GetNode() pure virtual function. This problem never happened in my same plugin project in 4.19,4.18 and so on. There is no … --- ## [4.20 Crashes when importing FBX if r.GPUSkin.Limit2BoneInfluences=True](https://forums.unrealengine.com/t/4-20-crashes-when-importing-fbx-if-r-gpuskin-limit2boneinfluences-true/433744)
**Author:** [@anonymous\_user\_f6530a3e1](https://forums.unrealengine.com/u/anonymous_user_f6530a3e1)\ **Replies:** 0\ **Last updated:** [September 13, 2018, 8:27pm UTC](https://forums.unrealengine.com/t/4-20-crashes-when-importing-fbx-if-r-gpuskin-limit2boneinfluences-true/433744 "2018-09-13T20:27:18Z")
Steps to reproduce: Clean ThirdPersonExample project. Insert this into DefaultEngine.ini: \[/Script/Engine.RendererSettings\] r.GPUSkin.Limit2BoneInfluences=True Import the FBX attached. Crashes with a missing shader … --- ## [Setvelocityinlocalspace inaccessible in intellisense](https://forums.unrealengine.com/t/setvelocityinlocalspace-inaccessible-in-intellisense/432790)
**Author:** [@crossmr](https://forums.unrealengine.com/u/crossmr)\ **Replies:** 3\ **Last updated:** [September 10, 2018, 3:26pm UTC](https://forums.unrealengine.com/t/setvelocityinlocalspace-inaccessible-in-intellisense/432790 "2018-09-10T15:26:32Z")
Bug: Intellisense reports function setvelocityinlocalspace is “inaccessible”, however compile works fine and the function is called correctly. Header is appropriately included. Steps to reproduce: call this function in … --- ## [Ctrl-W only works sometimes](https://forums.unrealengine.com/t/ctrl-w-only-works-sometimes/432947)
**Author:** [@Imagine-Games](https://forums.unrealengine.com/u/Imagine-Games)\ **Replies:** 10\ **Last updated:** [September 2, 2018, 1:27pm UTC](https://forums.unrealengine.com/t/ctrl-w-only-works-sometimes/432947 "2018-09-02T13:27:37Z")
Control-W (duplicate) only works sometimes with blueprints or any other thing… steps to reproduce. create a blueprint node, or a couple of them and select them Press ctrl-w around 5 times, it probably wont register a … [Next page](https://forums.unrealengine.com/tag/reproducible-bug/10320.md?match_all_tags=true&page=1&tags%5B%5D=reproducible-bug)