out of nowhere, Blender 5.1.1 gave me this as a material. not normal material interface
can anyone explain this and help me get rid of it.
You probably used some add-on or renderer that makes them.
I’ve never seen this, it’s probably an addon
Probably comes from https://firetools.org/bfds/
this model came from BlenderKit. when I downloaded it, it worked. Then it lost the image for the building walls. Probably have to recreate by hand.