Refering to my previous post Previews in Material Nodes always black (UE5.6 Substrate Enabled)
Previews in Material Editor are still black in the latest version when Substrate is enabled. When Substrate is disabled, the previews work as expected.
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I posted a fix in your original post. If you’re not a programmer, its still easy enough to add in - just copy and paste, and it’ll compile for you. You may need visual studio so you can recompile the binaries.