Hi Guys Sorry it has taken me a few weeks to report this because I have been away. Immediately after upgrading to Webmin version 1.900, Usermin version 1.751, Virtualmin version 6.04 with Authentic theme version 19.22 I noticed an issue with entering information in any text field in Virtualmin and webmin. After I returned one of my Usermin users called with the same problem when sending emails.
If you go to what I am assuming is any text field in Virtualmin, Webmin or usermin and put your cursor at the point where you want to add some text. Then hit enter twice to give you a bit of space before typing what you want to add. The page/document changes are saved.
I have since worked out that after the first enter press the focus of the screen moves to the save button on the page and no amount of mouse clicks will bring it back to the field you are trying to edit. In Usermin I was able to stop the focus going to the save button by switching the users setting Use HTML editor for composing? to Always. However no such luck in Virtualmin for example when adding log filter rules to Fail2ban clicking enter twice will save the page without any changes or additions.