Can you try plugging your Airline Booking Reference/PNR into either Royal Air Maroc's website or Royal Jordanian's tool? They sometimes allow you to select seats where you're eligible, but there is something preventing you doing it directly.
Note you'll need/want to check something like ExpertFlyer so you don't try to pick seats which are already allocated, as they don't always show the seats as already picked, and can throw an error.
Edit: responding to:
Originally Posted by
BabyBearNewYork
Got a nice agent who told me that the entire DFW-DOH flight has been blocked for advance seat bookings and it will only open up for seat allocation 24-72 hours before the flight[/color]
This is definitely somewhat true, for some weird reason that I don't understand. Our upcoming flight to Doha (on Saturday) is still showing almost the entire cabin blocked bar the seats already allocated; when the aircraft changed there were very few seats to select from.
This seems to be because QR will block the centre quad seats unless you're travelling as a group of 4, but even then it's not a hard and fast rule.
As a couple I was able to choose middle seats on a Q Suite quad flight, but only in some rows.
If you don't have ExpertFlyer, and post the date/flight number I can take a look at what the airline's booking system says which could go some way to helping.