Many issues you may run into such as; white screen, demo content fails when importing, empty page content, changing skin problems 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. Simply login to cPanel and click on the MultiPHP INI Editor icon. Adjust the settings accordingly.
- max_execution_time 180
- memory_limit 128M
- post_max_size 64M
- upload_max_filesize 64M
- max_input_time 60
- max_input_vars 3000
Also consider upgrading your PHP version to the latest version, the newer the better. Click on the MultiPHP Manager in cPanel to upgrade.