THe last two times when I made a reservation on the cx website, they didn't show under my "Personal Itineraries", only under the menu item "Retrieve your booking".
BOth times I wrote them about it, both times their answered came within 24 hours but clearly showed that they had no clue what I was talking about or didn't know why it was happening. Personal Itineraries is a MPC feature, Retrieve your booking is the normal reservation department, and obviously they are not talking to each other.
I have come to believe that CX has SERIOUS problems with their IT. I have observed some weird glitches that shouldn't happen on a professionally maintained - and properly integrated - system.