This is the worse webmin release ever.
Out of 7 clients I have each of them have all lost VM Pro features/addons/modules.
On my own box it completely deleted VM2 and VM Pro.
I had to reinstall VM Pro on all my clients boxes including mine plus re-download every friggin plugin.
Frankly I am less then impressed with webmin at this point and I advise anyone that hasn't updated to NOT update webmin at all until Jamie/Joe fix this problem.