Hello and welcome!
Unless your membership card is out of date (within 12 months from last renewal), shouldn't have been an issue, especially the flight departs from HKG. You may write a complain email for this incident but expect to get a canned reply though.
If you have received the plastic card, that means you're probably not in the case of "too new to update records in computer". Perhaps try logging in at CX website to check if anything's wrong with your membership status?
BTW, GR priority boarding is at the PEY line now. (In case no PEY, a dedicated GR line may exist)
Last edited by watery; Dec 1, 2016 at 7:31 pm