Just a minor point to add... I wonder if the new ADR system shows a 1-hour window at the restaurant, centered on the time you give.
As I mentioned in my above post, I wasn't able to get 'Ohana when I called last night, the CM said there wasn't any availability. (I just presumed she meant no availability all night)
I called back today, just in case, and got another CM. When I told her 6PM, I could hear her working on the system and sounding like she wasn't getting anything. She then said "let me expand the timeframe and see what I can find". She found a 5:10PM, and a 6:35PM. I took the 6:35, as our original preference was 6PM, but it was interesting that neither 5:10 or 6:35 didn't come up on the original search, which leads my to believe that it only shows 30 minutes before and after the requested time.
Looking at all of my other ADRs I made last night, they were all either spot-on to what I requested, or within 30 minutes.
So if you get a CM that says no availability, try having them check an hour later or earlier from your original time and see what pops up. You might just get something as close as 35 minutes from your original time.
Oh, and I got right through to an operator when I called this afternoon.
-Rob