Well, it turns out that after fiddling more with the browser that couldn't even search, that was a client side issue.
Ended up calling in to try to get the flight booked, and although they can see availability for the (DL) flight that I want just as it shows on the website, they also can't ticket it, and it isn't available at all! Man I am getting tired of trying to deal with the awards booking process, it seems like it turns into a massive trial about 50% of the time.