I have a site which was at the 2.5.16 version of Joomla, and I updated it to 2.5.18. And made new articles, changes to menus, etc.
After the update, I didn't realize that the site was very broken in the category view (due to the overrides in the views, this was the first time that happened, version 2.5.18 introduced a language parameter and my overrides didn't have that).
So, I tried to revert from 2.5.18 to 2.5.16 from my backed up files, but it didn't work that well! (no way to log in into the admin, or in the front end, it showed a blank page).
I read that it had to do with the session, or cookies, and I tried emptying them, but no luck.
I then understood that it was due to some change to the database, but I've never seen an update to a minor version that made a change to the database. I couldn't restore my backup of the database, because I made changes to the articles already in the 2.5.18 version. (NOTE: I made a copy of the site and restored the database to the backed up, and the login worked, which means it is definitely the database!).
Does anyone know if it is confirmed that the database was changed, and how to revert it properly to version 2.5.16?
Or is it related to something else?