Having upgraded my site to 2.5.0, I get a message on the Admin page to say "A new version of Piwigo is available."  If I click on the link to go to the update page, it tells me that I'm up to date.

Background on the upgrade: the auto update failed due to permissions and got into a sort of halfway state where the only page I could see was an upgrade page.  So I manually uploaded the files, then went to the admin page, which upgraded the database.  After that, everything else looked OK apart from the notification that there's a new version.

I've gone through the database tables looking for anything related to the old version and couldn't spot anything obvious.  Nor can I in the files that didn't get updated (galleries, local, upload, etc).

How can I get the admin page to realise I'm on the latest version?  It even says on the admin page: "Piwigo version Piwigo 2.5.0".