I’ve got Virtualmin Pro up and running on a paid Virtualmin AMI (Amazon Machine Image) on Amazon’s EC2 cloud - what a fantastic AMI!
I changed the default Webmin login password (changeme), using a couple of @ characters in the new password, and found that the password was not saved correctly - I was locked out of my Webmin server, and has to ssh into it, to reset the password, using alpha-numeric characters. So be careful not to use @ in the password when resetting your Webmin login.
BTW, thanks for making Virtualmin available on an EC2 AMI 