Cannot book a table via the VP

Hi! I am trying to book a table at the Verandah on QE on the world cruise next year via the VP (booking just became available). No matter which date I try (from January to May) all I get is

As you have crossed the International Date Line this date has been lost from the cruise calendar.

Anybody know what is going on?

Unfortunately the Cunard/Carnival web sites seem to be seriously bug ridden. Things you were able to do in the past, no longer seem to be there, and navigation through the site is a mess. The World Club part of the site is just plan sad.