If misery loves company, I had the exact same issue. I was so frustrated as it seems to work for other people. This was the first time I ever got up at 6am on my 180 day mark, and I expected the calendar dates to magically un-gray and was so disappointed (which sounds dramatic, but I was really bummed!). The only ADR that I could book farther than 180 days online was Afternoon Tea at GF.