When you click RVsitebuilder 7 icon in cPanel, but it returns BLANK page.
Your domain name may run behind NAT IP which is not validated by RVsitebuilder installation.
You can contact your Host Provider to fix this for you by giving them the following guide.
1. Run curl to test domain name :
2.1 Run: nano /etc/hosts
2.2 Add your site to this file.
3. Try to access RVsitebuilder 7 from cPanel again. It should work properly now.