Welcome to FT standoc

The website won't even let me view my account right now, so I suspect there's a technical glitch. Try calling them up if it is urgent. There's no online discount, so hardly makes a difference.

Edited to add: It was just the site being extremely slow. The only flight greyed out in my case is one that's already been upgraded using miles. It does let me check for the other flights, though I'm surprised it shows no availability when seatcounter and expertflyer both show seats available.