I wish I could help! I just tried to make my reservations at my 180 day mark bright and early this morning and it will only go to June 18. I called Disney Dining last night with a question and the lady I spoke with was really encouraging me to call in my reservations, I couldn't figure out why, but maybe she knew I wouldn't be able to do it online.
I guess I'll be calling at 7!
Good luck!