I totally agree with BlondieTink. With AKV & BLT owners getting developers points and their home resorts not open yet this is creating a "shortage" of rooms available. Hopefully this will improve by this time next year.
As DVC membership grows planning will become even more important; I have been a member for over 4 years and have made about 12 trips to WDW providing rooms for both family anf friends. Maybe I'm lucky but I have always been able to get accomodations that I wanted. I've even made a short term ressie, calling on a Fri afternoon for a Sunday check-in in Sept. As all of the new members learn how to use the system it is bound to cause a shortage of rooms at popular times. As a DVC member we get rooms subject to availability. That doea not mean ALL members can get a room on new years eve for example.
I do agree it is frustrating that you as a member cannot get a room but "Joe Traveler" call go on line and book a room at a DVC resort that is unavailable to you. These were the terms we agreed to when we signed on but that does not make the pill any easier for the OP to swallow.
Just my 2 cents
This is not entirely true as far as developer points go, the only DVC resort that most not all but most of these points can be used at is SSR and SSR was available for the OP.
As for "Joe Traveller" he isn't booking a room that is unavailable to another member he is booking my room so that I can go to California and stay at a DL hotel on points. So either way the room isn't available.