There is a bug that has appeared in Virtualmin. It happens in 3.73, but I can't recreate it in 3.57 on a different machine.
If I select a virtual server from the dropdown menu at the top left, and then select 'Edit Virtual Server', for example, the left frame then refreshes WITHOUT remembering the chosen virtual server.
This could lead to inadvertently making further changes to the wrong virtual server if not spotted.
I hope that makes sense.
Great work, as ever!