I am having the same issue. I’m on Windows 11. Only happening in 5.7. Might have something to do with the new Substrate materials. I am unable to find a fix.
After my original post above I went into a 5.7 project and in the Project settings, I searched for Substrate and in those settings I disabled the Substrate Materials. That required a restart. I can now use Material Designer. Hopefully a fix will be made so substrate materials will work with Material Designer.
Hi Lee,
Great, this fixed it for me.
The funny thing is that this happened when I was following one of your older tutorials on YT.
Thank you for the work you put into teaching