Unreal Engine Issues

EDL in 4.15 may not be fully safe and should be disabled by default

EDL may have some issues that are very hard to reproduce that's why we should disable it by default in 4.15.2. We will re-enable it in 4.16 ...

User Defined Enums may lose their display names on upgrade to 4.15

Some users are reporting that User Defined Enums are losing their display names when upgraded to 4.15. ...

Setting Fixed Frame Rate Prevents Particle Collision In PIE, Standalone, and Packaged Game

If you set the project to use a fixed frame rate, particle collision no longer works. ...

HTTP GET requests are much slower than a Python script by a factor of 15-20x

Based on user report, a HTTP Get request from UE4 is 15-20x slower than if using a Python Get request to get the same file. ...

In the Anim Sequence Editor set a Notify's MontageTickType to be fixed to BranchingPoint if that Notify is a Native Branching Point

To avoid confusing users when working with a Native Branching Point Notify set its MontageTickType to be fixed to BranchingPoint.  ...

"Fix root motion initial rotation handling" commit breaks root motion completely

Enabling and processing root motion causes animation to rotate the wrong direction. Roll instead of Yaw. Pitch instead of roll etc. This error does not occur in UE 4.6. ...

Command buffer failure rates increased on iOS 15 devices compared to earlier iOS versions

There is a licensee report that command buffer failure rates on iOS 15 devices have increased compared to earlier iOS versions, and the issue may be related to foregrounding or backgrounding. ...

Fix up redirectors can fail if some packages were already checked out

Fix the skeletal mesh merge tool material assignment, change the API to avoid confusion

UDN user ask us to change the API for the material to remove confusion with the material ID. Also apparently there is an issue with the skeletal mesh merge tool, the user did not give any repro ste ...

Level Bounds Incorrectly Calculated If Particle System Does Not Have "Use Fixed Relative Bounding Box" Enabled

If "Use Relative Fixed Bounding Box" is disabled, level bounds will be incorrectly calculated. This seems to be similar to [Link Removed]. Found in 4.19 CL# 4033788, 4.20 CL# 4212847, 4.21 CL# 4233 ...