I manually upgraded WordPress to the current version today. (manually because the previous version was very old). The upgrade worked but in an unexpected way.
Navigating to sitename/wp-admin/upgrade.php yielded a blank page.
The dashboard is inaccessible. This is what appears in the browser address bar:
The site itself is visible, and in source I see that it is version 2.91.
I've never encountered this before on any previous upgrade, and I'm totally stumped. Does anyone have any ideas or suggestions?
Regards & TIA