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Prepared a video showcasing some strange issues in the Mailing Lists area:
Things to note:
1) Visiting the list of lists there's options to create new lists
2) In the list of lists, the # of subscribers shows for all lists
3) When editing a list, the # of subscribers doesn't show at the top
4) When editing a list, the page wants a Webmail URL and a Password (boxes appear yellow)
5) When editing a list, even if no changes are made to the settings, navigating to any other page triggers the "unsaved changed" dialog
6) Going back to the list of lists, there's no longer an option to create a new list
For #6 - if you look carefully there's a double-slash "//" in the URL. There's only a single slash when visiting the list of lists the first time around.