You have neglected to state your server environment.
Approx. four days ago, I installed a VPS from scratch, and using the official documentation installed CWP (free), on to CentOS 7, of course.
Two days ago, I transferred a Pro license to this new VPS IP address and it worked flawlessly.
With this in mind, I propose that it is down to the way that you have setup your server/VPS. I suggest that you back up any user files and do a complete reinstallation.
Pro tip (for CWP & CWP Pro):
Prior to "3. Reboot Server"
yum -y install epel-release
yum -y install ccache