I have installed a theme I bought with Magento CE 2.1.5, but the page under Content / Design / Configuration is completely blank:
I reinstalled everything several times, I tried reindexing, flushing the caches, etc., with no success.
How to fix this?
Go to Solution.
Found the solution myself, on the server configuration page of my admin panel the option "allow_url_fopen" was off. I turned it on, reinstalled everything, and it worked!