I do think they've fixed something. I have 10/15-10/17 at BWV in a studio for instance. In the past if I went to modify and looked at those dates, it wouldn't show availability there for 10/15-10/17 (unless there was another room available on top of what I had of course). Now it does show that availability. I'm hoping this means the backend system is now capable of correctly reconciling existing reservations against availability so we won't have the modification issues we've had so much.
I also recently noticed twice that waitlists are getting reserved but not processed. I had a BLT waitlist for one night for months and it never came through. I dropped it, then immediately searched for that night, and it was available... which tells me the system was holding the night for me but never getting it actually booked. This happened with another night at another resort too. Hopefully this will clear that up as well, though I know part of the issue may be needing a CM to process the change.