Here is a few thing I found Authentic Theme.
In Webmin/Others/Upload & Download and tab "Download from server". If I select a file or a folder and do the download the progress-bar never finishes, leaving the download button "disabled". To download another file I have to click Upload and Download again in the left menu.
When using English US(EN), or maybe other non UTF-8 languages the hyphen In the browser tab gets messed up, it shows three strange characters. I have seen this from many programs, the are "translated" into a strange hyphen. If I copy text from some other and paste it into UltraEdit as unformated text and then paste it to a HTML page the hyphen is messed up/wrong, but if I delete and rewrites the hyphen in UltraEdit (it looks just the same) and then paste it to a HTML page its OK.
In File Manager, when extracting a compressed file all files and folders gets root-root. I often uploads big zip-files that includes many files and folders, sometimes hundreds. Then I have to change owner manually! In Java File Manager setting you can select the default user as "same as the directory". Or if you want to change you can do it in the upload dialog. And you also can select "Upload, Extract and Delete file" in one action - Really nice! I manage all our customers virtual servers and pages from our root login.
The right frame sometimes has a scrollable window/frame in the right frame making the scrolling really hard, especially when on a smaller screen. You then get the right frame scroll, and also the window/frame inside get a vertical and sometime also a horizontal scroll, and with three scrollbars the moving around gets really time consuming and hard. Why cant the content be displayed directly in the right frame?
OK, enough this time.
BTW, I really think the Authentic Theme is very nice, good looking, fresh and "up to date", but I have to say, I liked to use the Framed Theme better, very clean, easy and fast to work with. I know Virtualmin soon will drop the old themes, so I'm trying to take the step from the old and passed into your nice looking Authentic Theme.
Using Virtualmin Pro, CentOs 7 ,Windows 10 Pro 64-bit Swedish, Firefox 52.1.0 ESR 32-bit Swedish.
Thanks! Regards, Leffe