Unreal Engine Issues

iOS apps crash on devices with iOS version 11.2.2 when Metal 2.0 is enabled

Launching an iOS App that is set to Metal 2.0 on a device with iOS version 11.2.2 causes the app to crash and return to the home screen. This was tested on an iPad Pro as I do not have access to any ...

Crash upgrading a UMG project

HydroErosion on landscape crashes on Linux

While on a Linux OS, the editor immediately crashes if the Hydro Erosion tool is used on a landscape. ...

Changing "Coordinate Light Map Index" When "Generate Lightmap UVs" Is Enabled In A Static Mesh Crashes Engine

When altering "Coordinate Light Map Index" in a static mesh when "Generate Lightmap UVs" is enabled in LOD 0 the engine will crash or "Coordinate Light Map Index" will be set to 0. A demonstration ...

When a Sublevel has "Initially Loaded" set to true and "Initially Visible" set to false, the Editor will crash after exiting PIE

If you have a sub level with "Initially Loaded" set to true and "Initially Visible" set to false it will crash after exiting PIE. This issue was reported and tested in 4.20.1 (CL-4233996). It has ...

Crash when recombining Value Pin after swapping Target Wild Card pin from a Vector2D to a Vector on a Set By-Ref Var node

This is not a regression. Tested in //UE4/Release-4.27 CL18319896 Crash when recombining Value Pin after swapping Target Wild Card pin from a Vector2D to a Vector on a Set By-Ref Var node.  ...

Camera modifier blueprint used in another blueprint crashes editor (Assert failed in edit condition code in details panel)

Changing the default values inside of a camera modifier blueprint when referencing it in another blueprint results in a crash. Tested in 4.21, 4.22, 4.23 and 4.24 ...

When changing the size of detail panel for animation state in Animation Blueprint diff tool, GetSelectedProfileName will occur crash

When trying to display BlendProfile property in Animation Blueprint diff tool, it will occur crash, because EditableSkeleton is null in SBlendProfilePicker::GetSelectedProfileName(). So, a followin ...

[CrashReport] Mac/Metal crash due to enabling Metal 2.0 on 10.12.6

This is an early trending Mac/Metal crash coming out of 4.18. Mark.S: _Revised Statement: Users are trying to enable Metal 2.0 on 10.12.6. The iOS settings panel lets me show warnings about this st ...

Parameter distributions can be reset to None in Cascade Particle Systems, causing Cascade to Niagara conversion to crash the editor.

Cascade to Niagara conversion causes the editor to crash due to any distribution parameter in the Particle Emitter being reset to none. Repro Rate: 4/4 Tested this in //UE4/Release-4.27 @ CL# 1831 ...