source of problem appears to be including Starter Content in a new project, or migrating it to a project for first time. We believe it’s getting caught at stage where it compresses all textures, which can take a very long time depending on project, even on a powerful Mac. We’re checking to see if these template projects don’t include prebuilt DerivedDataCache or if there’s some other rendering problem. I’ll keep this post updated as I get more information. Thanks for your patience!