T-60 now relates to flight time?

T-60 today for our October return flight from NYC. So as usual I logged into my account at 0800 and clicked through. Seat map available, all seats available, so I chose the ones we wanted and submitted.
"Sorry, these seats are unavailable, you are still in your original seats".
Hmm. But as T-60 is today, we don't have "original seats". Tried again. Same thing.
So I rang FC to be told that yes, she could book the seats for me, and did, but I couldn't do it online till after my flight time (1930). Told her this had never happened before, it was always 0800 irrespective of flight time but she said no, it was flight time, not 0800. And my experience on the website bore this out.
So is this new? Can't think it's her mistake when the website seemed to confirm it.

"Sorry, these seats are unavailable, you are still in your original seats".
Hmm. But as T-60 is today, we don't have "original seats". Tried again. Same thing.
So I rang FC to be told that yes, she could book the seats for me, and did, but I couldn't do it online till after my flight time (1930). Told her this had never happened before, it was always 0800 irrespective of flight time but she said no, it was flight time, not 0800. And my experience on the website bore this out.
So is this new? Can't think it's her mistake when the website seemed to confirm it.
