No Admin access after WP Upgrade

I just got an email from my WP installation telling me that the system had automatically upgraded itself to the latest version.

Whilst my site frontend appears to be working fine, it seems that I am locked out of my WP Admin. Whenever I navigate to wp-admin I get a screen with the following message:

No Update Required

Your WordPress database is already up-to-date!

The only option is to click a button labelled ‘continue’. If I click that it just reloads the same page with no way to advance other than in this infinite loop.

A bit of a Google search shows a few similar yet older instances where this is related to Memcache(d) plugins. So I tried removing the ‘object-cache.php’ file and my access is restored. However, replacing the ‘object-cache.php’ reverts back to the original issue.

So it would seem that the Memcache / Memcachier cache needs to be flushed after the installation.

I also recently noticed that when performing a bulk plugin upgrade, that the ‘upgrades/update’ counter insisted on saying 2 or 3 of these same plugins still needed updating. After repeating the upgrade/update process several times I decided to manually flush the Memcachier cache, and this finally got the WP Admin to acknowledge that all plugins were up to date.

So, it seems sometimes (if ever) the Memcachier cache needs to be flushed but isnt being. IS there anything that can be done to this plugin to cater for either of these scenarios???

Any help in dealing with these issues would be greatly appreciated.

Thanks in advance.

https://www.ads-software.com/plugins/memcachier/