Unreal Engine Issues
Unreal Engine Issues
Can't Play In Editor after editing color value in color picker
UE - Anim - Runtime - Oct 23, 2020Can not launch PIE after set the value in color picker window to enter a number from the keyboard. Choose the color value with the picker or close the window with the Cancel button to return to it. ...
Details Panel - USTRUCTS do not save their expansions properly
UE - Editor - Workflow Systems - Oct 6, 2023Currently USTRUCTS do not support saving expansions properly. While we won't implement a separate pathway for USTRUCTS to save their expansions, a general solution to save expansions for class or st ...
Cloth Asset - Cloth bounces off wildly during the rendering of a sequence in MRQ.
UE - Simulation - Physics - Character - Jun 26, 2024The motion blur rendering is causing some issues when rendering the cloth asset as the timestep wildly changes without the number of substeps being increased, The movie pipeline code needs to man ...
Editor crash after reverting a Blueprint asset in source control
UE - Framework - Blueprint Compiler - Feb 26, 2025Added context from dev support ticket:The crash occurs because FDelegateProperty::Serialize accesses a dangling SignatureFunction pointer. Given that its derefencing dangling pointers the specifi ...
Custom fallback mesh LODs for Nanite-enabled meshes not working
UE - Graphics Features - Sep 15, 2025Creating a custom fallback mesh with LOD for Nanite-enabled meshes with multiple materials, results in mesh LODs with errors. As the number of material sections (material slots) decreases with coars ...
Can't PIE or Save: Editor gets into odd state when editing parameters.
Tools - Jul 20, 2016I've seen this happen in other areas of the editor as well: Data Table fields (floats) for example. Manually typing in numbers to fields seems less prone to this error; using spinners to drag value ...
[daydream] Black screen with FirstPersonTemplate and 4.15P4
UE - Platform - XR - Feb 17, 2017https://answers.unrealengine.com/questions/561763/daydream-black-screen-with-firstpersontemplate-and.html Any msaa setting except none results in a black 3d scene on daydream. ...
iOS movie become laggy and crashes when played in iPhone 6/6s.
UE - Platform - Mobile - Feb 24, 2017Movie play in iOS is laggy and crashes in some movie. This issue seems to be happening when the movie is played in umg widget. Tested in 4.14.3 4.15 Dev_Mobile Latest as of 2/24 Original UDN post ...
[CrashReport] Linux Crash in FActiveSound::GetWorld()
UE - Platform - Linux - Aug 11, 2017This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below. Error message: SIGSEGV: invalid attempt to write ...
FBX skeletalmesh animation import use an integer for sample rate
UE - Editor - Content Pipeline - Import and Export - Sep 11, 2020Integer sample rate is not playing well with 23.976(NTSC/24) sample rate, the curve get resample at 30Hz in that case and we loose precision. We need to support FFrameRate sample rate to get accura ...