Unreal Engine Issues

UMG/Slate scroll bars have a minimum size for scaling

A user has reported an issue about scroll bars having a minimum size in UMG and Slate code, causing them to not scale correctly when the scroll box is at a smaller size. This affects both horizontal ...

Unable to Edit Default Struct Key of TMap

In a TMap where the key is a struct, it is not possible to edit the default value of the struct. Found in 4.15.0 CL# 3299760. Reproduced in 4.16 Main CL# 3345747 ...

Major performance drop with instanced meshes since PhysX 3.4 upgrade

Major performance drop with instanced meshes since PhysX 3.4 upgrade Regression: YES Worked: 3172292 (4.13.2) Broken: 3249277 (4.14.3) For me, my results were: 4.8 through 4.13 No Collision - ...

Meshes Still Casts Shadows With Unlit Materials Applied (Misleading Tooltip)

The "CastShadow" option on primitive component has a tooltip that says "This flag is ignored (no shadows will be generated) if all materials on this component have an Unlit shading model." This isn ...

No warning is shown when a disabled mobile shader permutation is required for rendering

Crash when element is added to a map variable with unhashable key

Crash when element is added to a map variable with unhashable key. An error is thrown on compile but an element can still be added under the Details panel of the variable. Crash Reporter: [Link Rem ...

Ensure triggered when exiting PIE with dedicated server options

When "Use Single Process" and "Use Less CPU when in Background" are checked off, running a dedicated server in PIE will cause an ensure on exit Regression: Yes - Behavior does not occur in binary 4 ...

Material Slot Names Get Replaced With "None" After Merge Actors Operation

After merging two actors the resulting merged actor's slot names will be replaced with "none". Fixing this is a very tedious process for our licensee since there usually is a large amount of slot ...

Changes to the Navigation settings aren't saved when edited in the Static Mesh Editor

Changes to the Navigation settings aren't saved when edited in the Static Mesh Editor. The values will reset back to default values when the asset is reopened. ...

ICU was built with timezones disabled for Android

ICU for Android was built with U_TIMEZONE defined to 0, which means that ICU always considers itself to be in UTC, rather than use its default Android implementation. We should try and build ICU ag ...