Ok, I called
UT to see what the story is and because we have two, possibly 3 family members who don't have their tickets yet. She told me that what was happening is that Disney was selling tickets that they had available for 3rd party sellers. I'm probably not wording that right, but basically they sold the inventory that the 3rd party sellers had available to them, which is what led to people ordering tickets through UT for the next few parties and having to have them cancelled. She also said that October 1 is close to selling out, so rather than keep the date available and have Disney do the same thing again....over sell the tix, they took it off preemptively. I really like UT and have used them a lot over the years for all kinds of tickets and I'm really disappointed that Disney is putting them in the position of having to cancel on their customers.
She also said if you want tickets, don't wait on it. I'm passing that on to the rest of my family ASAP.