I have a small install of Confluence in an enviroment that will only be accessed by 4-5 users. To keep things simple, I turned on Anonymous access and allowed anonymous editing of pages.
When a page is edited anonymously, a popup appears:
Fairly standard stuff, expect there's no close button on this popup. That's a bit of a problem because it's on top of the editing tools.
If you reload the page, the popup re-renders with a close button:

I've been able to reproduce this in Chrome, Firefox, Edge and Safari and on multiple platforms (Windows, linux, Mac and iOS)
Am I right in thinking this is a bug? If so, is it known and/or been fix in a more recent release?
My confluence info:
Confluence: 6.9.1
Server: Ubutntu 16.04
SQL: PostgreSQL 9.6.9