I was using your free plugin and upgraded to the paid version. I had 4 grids made querying projects and it was working fine. After the upgrade my page will not load and give me a gateway error. I still works for pages and posts but no projects.
Welcome to our forum.
Can you please send me your link?
You probably use post grid shortcode inside post content that displaying on the grid, please try exclude the post id in which post/page you are display,
If you do not exclude the current post id it will cause infinite loop result will site error.
If you send me a temporary admin access i can check the issue.