--fixed now.
Sorry about the version mismatch Al. I forgot to update version.php. Try this one.
And Chris, since the mod pulls stuff from the db, then you could create a db table for each course that holds the number of hours, or, it might be possible to get the course ID number to print on a certificate and you could use that to hold the number of hours.
I have posted some activity locking code that should work in 1.6 with the certificate, you can try it here: http://proemployees.com/ActivityLockingWithHide-1.6.zip
You will need to manually create/update the db tables (the easiest way is to use phpMyAdmin to import the included mysql file).
