Well... I was wrong!
WSX 1.1.0 has been just released (for both Windows and Linux) and the issue seems to be gone.
I upgraded WSX from 1.0.2 to 1.1.0, rebooted the CentOS host and the WSX starts just fine!
I am finally able to login into WSX after a host reboot.
Whatever you did... good job, issue resolved!