Unreal Engine Issues

Editor Crashes on Opening After Deriving C++ Class from Another Class

After deriving a C++ class from another class and then closing the editor, the project will crash when reopened. This crash will continue until the project files are regenerated and the project is r ...

LODbias settings appear to have no effect when specified by GPU on android

When setting the LODbias via the device profile for a specific Android GPU it does not appear to have an affect on the textures when run on the device ...

Duplicating BP actors reset edited Variables to Default Value if Variables name start with Chinese Character

Hints: It has no problem in 4.24, only happening in 4.25 It has no problem as long as the Variable name is contained with Alphabat(English characters) fully; or start with Alphabat(A_变量 is fine) ...

VirtualTexture performance is much worse on SM6 than SM5

Deleting a material layer from the stack reverts other layers' overridden parameters to default

It appears as though parameters for downstream material layers are reverted to their default values and override states when an upstream material layer is deleted. ...

Live Coding doesn't auto-compile upon reopening a project

When creating a C++ class and compiling utilizing Live Code, upon creating a blueprint class utilizing that C++ class as it's parent and restarting the editor, the blueprint class loses it's parent ...

Collision between Vehicles and Instanced Meshes are behaving differently than expected

This is a regression tested in //UE4/Release-4.27 CL18319896 Vehicle from the Vehicle template clips through instanced meshes, and can't be driven on them.  ...

Reset Instance Changes to Blueprint Defaults does not reregister components

For map placed blueprint actors with components with property modifications, when triggering Reset Instance Changes to Blueprint Default from the actor instance's Details panel, any components with ...

PIE window does not match what was set in the New Viewport Resolution setting

Setting the resolution of PIE to 4K Ultra HD results in the new PIE window going very far out of the bounds of 4K. If you are using two monitors the PIE window will bleed over a good bit into the ot ...

Actor attached to other actor in LevelInstance has very large bounds

Attached actors do not return to LevelInstance space at the end of LevelInstance editing, and bounds contains level instance offset location. This results in huge bounds. My workaround is:  void FL ...