The guild pattern page won't take new guild items at or even for a while after 7 AM Pacific... it still shows the previous day's items in the "Item" select drop-down. (yes, even after reloading the page.)
For instance, it's a little after 7:30 right now, and I still can't select "Cythara Anglica" for the Veteran Woodworking guild item... it only provides the items from yesterday. I don't know the actual time that it starts showing the new array, as I haven't had the chance to sit and keep trying every few minutes - perhaps it's just off by an hour?