Thread:Project:Support desk/Upgrade from 1.11 to 1.22 : Blank Page & Nothing can be seen/reply (3)

Ciencia is right.

Apart from that I would replace your DB with the backup and then run update.php again. Maybe it somehow started, then got an error and now you cannot update the DB correctly anymore...

Note that you should run update.php not with the webbrowser (you posted that link above) but from the shell. Upgrade has some information on that as well.

Does that help?

If that still does not help, then please tell us, if you have any extensions installed! These might need an update as well. Possibly deactivating them for the update and then updating them one by one afterwards might help in that case.