Why can't I "Manage My Flight"???

I've logged onto the VAA site to have a look at my seat for my VS44 (MCO-LGW) next Wednesday, however the seating plan that I get on the screen in "Manage My Flights" shows NO other available seats for the whole of PE, even though the schedule/load tool on this site implies there's certainly a number of available seats.
Is it that there are more than 40% of the PE now sold and therefore they're not showing anything now, or is there some other reason why there appears to be no other available seats for me to select at all in PE???
Thanks.
Is it that there are more than 40% of the PE now sold and therefore they're not showing anything now, or is there some other reason why there appears to be no other available seats for me to select at all in PE???
Thanks.