A few users have reported that they are being somewhat randomly logged out when browsing the controller user interface after upgrading to 5.12.7.

This seems like something in common and it looks like it is a bug in the software. From what someone shared, it looks like maybe a page is specifically calling for /img/svg/PaginationLeftDisabled.svg when it should be /theme/img/svg/PaginationLeftDisabled.svg.

So I can login and navigate around just fine but if I directly try to access https://<controller-url>/img/svg/PaginationLeftDisabled.svg, it kicks me back to the login page if I try to load anything else.  I couldn't specifically reproduce the issue myself while browsing the web interface but I wonder if it has something to do with some data being cached in browser from the previous version.  Either way, I figured I would report it.