I just got off the phone with an Aeroplan agent who said their system was having technical difficulties with booking OZ reward flights for the last few weeks. They are unable to book either online or at the call center. I asked if he could place a phone call to Asiana to book, and he said no.
I asked if they were working on the problem, and he said yes.
I asked if he had any idea how long it would be; weeks? months? he said no.
I have the feeling he didn't have a clue, but was able to confirm at least it is a problem, (not intentional) and they are aware of it.
I hope they fix this problem SOON! I need to book a flight in Jan.
Any updates or further information would be appreciated.