After calling in about 150 times and then waiting on hold almost two hours, I finally got through to Passholder Services about the inability to book more than a handful of days with my AP voucher and multiple DVC reservations. She did say that it is a known issue (obviously) but that they are notating accounts and sending specific feedback to IT. She said to keep using Chrome because it seems to respond to the new system better.
She did NOT mention anything about AP reservations being purged but did say that they are hoping by "this afternoon or early evening" they will get the glitch fixed and we SHOULD be able to book all of the days once they fix the system.
So that wasn't entirely helpful but I feel better knowing I did all that I could. Now I guess I just wait until either someone else posts that the glitch is fixed or I randomly try again in a few hours!