After a MySQL crash (or PHP upgrade) at my hosting provider, my site started to misbehave. Badly. Drupal refused any login attempt, which is, as you can imagine, quite impractical. For days, I searched the Drupal forums, tried every hint of every problem which looked somehow like mine, but without any luck. I got my site back in hand after :


* backup database and website pages
* drop the database, remove all Drupal webpages, and reinstall.
* create a new admin user
* log out
* drop the entire database again, but keep the users table.
* Restore the database except for the users table
* Restore old Drupal pages


There might be some things which can look weird, but I hope to correct those in the next couple of days...