I’ve tried to reproduce this on my machine but am unable to.
Can you clarify some things that you’re seeing in this?
You mention this worked with Splines before but not now: What version of the engine did this work and what version does it not?
With regards to the black spots. Is this only happening with your project or are you able to reproduce a similar effect in a blank project? Have you adjusted the Distance Field Resolution scale for the meshes in question?
On Windows 10 are you using the DirectX 12 version of the engine or the Publicly available DirectX11 version that is available via the launcher and GitHub?
The more information you provide, especially if you are able to repro in a blank project can help me look into this more quickly and hopefully get you a resolution.
Problems seems to be connected to sahder cache. I dunno might get corrupted or something. Because I deleted it, recompiled all shaders and it seems to be working right now.