But, I was getting offered multiple seats from rows 21 through 25 as noted before, and in fact still do see that when I just checked again. I've not seen the scenario noted above where only the one seat was available for selection.
I would guess either the aircraft is not well loaded, or you are more than 72 hours from departure?
I have to say that when I was working with
BLHD with the various screenshots it looked like we were dealing with 2 completely different aircraft. In fact
BLHD initially suggested we try another service since he thought it was too full to give useful pointers!