by Nadav Kavalerchik.
UPDATE:
We are using a Web Service to enroll users from a remote SIS (MICHLOL which is developed by RASHIM)
Which works fine.
On top of it, one of our DBA added some code of his own which was moving the Frontpage course from category = 0 to category = 4 (some hidden category), which IT SHOULD HAVE NOT !!! and was the source of this issue
Now, it all fixed