I backed up a database like usual and when I clicked on "back to login" the screen flashed and reloaded, tried going in froma fresh tab and it send sme directly to management.
This had never happened to me and I did not get an error when I backed up the database nor when I restored it with a different name.
If you go to drop database you'll see that there is no database so the problem must be on your database config, permissions or something crashed on your database. Restart your database and your openerp service.