I downloaded the free version of 'post grid' and set it up. I wanted to extra formatting options, so I went ahead and purchased it. When I downloaded and installed the purchased version, WordPress complained that the folder already exists, so I deleted the old 'free' plugin and installed the paid version.
I now can't get the paid version working. It just says 'no posts found'. It is set up exactly as the free version was, but it is not finding any posts.
I tried deleting the grid I had made on the free version and creating a new post grid on the paid version. Still no posts found.
I feel that I must be missing something obvious?