I have a MacBook Pro M3 Max, 64GB RAM, 4TB HD and I have issues as well. I can open UE5.4.1 just fine but when I drag the skin from the Content Drawer(MegaScan Surfaces) in Landscape Mode from a blank project and try to do anything, it freezes. I have tried to keep the file name short and saved it to the Desktop to see if that was the issue. Also read that someone took out the Config folder so I tried that as well and I was then able to open the project but lost the Material I added to the Landscape. I was able to sculpt but as soon as I tried to smooth, immediately it crashed again. I think I found a bug?