I just got my tickets through DVC member services.
I tried various numbers between 7 and 9. Got the same busy/silence as everybody else. 45 seconds before 9, I called DVC and got busy signals, but it only took 5-10 attempts before I git through. I put in all my DVC info only to get the automated call-back-later-hang-up. I kept trying and selected Spanish when that option came about (I speak enough Spanish to buy these tickets) and it said (in Spanish) that there was a 40 minute wait. Right at the 40 minute mark a rep answered (in English) and I was able to buy for opening night, which is during my August trip.
Good luck everyone. It really shouldn't be this hard......