I am trying to book a BA flight using Avios for next May. Each time I try, even using different browsers and clearing the cache first, I get a response that flights can only be booked 355 days in advance. Even if I try booking a flight for next month I get the same response. I don't know what could be causing this problem. I did try booking a revenue flight just to see if the same problem occurred and it didn't. Anyone have any idea what's causing this problem and how to fix it? Thanks.