Background Blur Crash with 5.7 and Instanced Stereo

[FSapio]

Hi,

This is a 100% reproducible crash with the following steps in Unreal 5.7.1:

1. Create a new project (even an empty template)
2. Enable Instanced Stereo
3. Create a User Widget
4. Add a Background Blur
5. Set the Blur intensity greater than zero (e.g. to 10)

You will get a crash
Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\RHI\Private\PipelineStateCache.cpp] [Line: 584]
Shader compilation failures are Fatal.

Since we are developing a game that can run both with and without VR, we would need background blur when the game is launched not in VR.

(Our project comes from 5.4, which doesn’t have this problem. didn’t test it in 5.5 or 5.6)

Also, not sure, but could it be related to these? (however, in the blank project I didn’t touch any Virtual Textures and/or PCG)

• Unreal Engine Issues and Bug Tracker (UE-351347)
• Virtual Texture + Instanced Stereo broken in 5.6 and 5.7 preview

Is there any plan to fix this?