Many issues that you may run into such as: white screen,400 error, 500 error, demo content fails when importing, empty page content and other similar issues are all related to low PHP configuration limits. The solution is to increase the PHP limits. You can do this on your own using cpanel, or contact your web host and ask them to increase those limits to a minimum as follows:
- PHP memory_limit = 256M
- PHP max_execution_time = 300
- PHP Post_max_size = 54M
- PHP upload_max_filesize = 128M
After this, if you facing still issue you can alternatively send a support request to firstname.lastname@example.org and we will help you to fix this.