I have upgraded to 1.4 successfully but when I go to a course I obtain an error saying that one folder: moodle/mod/attendance was missing.
So I had to copy this folder from my backup and now it works fine. Apparently.
But now I am afraid I have old versions of these files mixed with the new version. ¿Should I worry about that? ¿Why there is not a moodle/mod/attendance folder in the download file provided for version 1.4?