Blank or white pages on your site indicate an issue with your server directly and you should contact your hosting provider for assistance. Possible causes:
1. Your back end server is returning a 500 internal server error.
2. A caching plugin or extension for your site is causing a conflict.
If you want to see if your server is having an error, you can run the following command in terminal:
curl -v -H 'Host: yourdomain.com' your server IP (Ex: 126.96.36.199).
Note: Replace yourdomain.com with your actual domain. Your actual server IP needs to have one space after '.