Originally Posted by KingCanute

It is possible there has been an aircraft change to account for losing the previous seat assignment. And if all of the usually unblocked seats had already been selected when you booked (and the majority are blocked from single travellers in Qsuite aircraft) there would be none left to choose from. It is also possible that QRs system may keep some seats back for frequent flyers and/or people in higher fare buckets (as some other airlines do), rather than making everyhting available for passengers on P fares.

In the event of buying a discount P fare and not finding the perfect seat available in advance, the best advice is to arrive at the airport early. In Qsuite layouts, 1A and 2B are generally held back for allocation at the airport. Likewise any seats blocked for bassinets may also become available then.

Enjoy your flight!