Can a server configuration, such as memory limits, contribute to the 'the response is not a valid JSON response' error in WordPress, and how can I address it?

Yes, server configuration can contribute to the error, particularly if the block generates a large or complex JSON response that exceeds the PHP memory limit. To address this: 1. **Increase PHP memory limit:** Modify the `memory_limit` directive in your `php.ini` file or `.htaccess` file. A value like `memory_limit = 256M` or `memory_limit = 512M` can help. 2. **Optimize the block's data:** Ensure that the JSON data generated by the block is as lean and efficient as possible, avoiding unnecessary data. 3. **Check server logs:** Review server error logs for any memory-related errors, which can provide clues to the problem.