After repeated discussions here on FT, PMs with LY reps, phone calls, etc., I still cannot select seats for any flight booked outside of LY's website. I need to call in to have the seats booked. Incredibly enough, my TA is (usually) able to book the seats even though the TA didn't actually book the flight. But LY's very own website cannot book the seats. And I still have a hanging flight without seats booked.