I went online and checked availability for my entire stay... only one night was sold out. So I called
DVC to book trip and get sold out night on cash. MS stated 3 nights (!!) of my trip were booked solid. She asked me how I knew they weren't...and I told her I was on dvcmember website. She stated that me "viewing" but not yet booking that ressie could be why it's showing sold out. She had be back out of dvcmember booking and logoff...and POOF! the sold out nights reappeared in her system. So, when "checking" your availability...they really are holding that reservation while your screen is open... so remember that when you call. Logout first...LOL!