I did a fresh setup of magento2 and upon completion, I couldn't set any configuration options in
Content > Design > Configuration. The table rendered with no available results.
After trying numerous troubleshooting steps, I finally deleted my custom theme out of the app/design/frontend/vendor/template folder. Once
app/design/frontend/ only contained the
Magento folder and nothing else, the install properly set a default configuration for the stores and the
Content > Design > Configuration renders perfectly normal. I am then able to copy my custom theme back into the frontend design folder and set it as active.
Apparently, Magento2 completely falls apart and can't set the default Luma theme if you have theme files installed. Has anyone else encountered this bug? Could there be something in my custom theme that causes a fresh install to fail when setting the default theme?