We just experienced this.
We just paid our deposit a few weeks ago and i called immediately to bank our points (june 09) and make a ressie.
I was disappointed when i called and couldn't get the full week of 12/4-12/11 we wanted at BLT. They didn't have the 5-6 available, which is odd, since that is a sunday/monday. Of course we were at the 10 month mark then, so we had missed the 11 month opportunity. I knew it could be tough to get exactly what we wanted in terms of view- as I knew early dec is very popular, but i was surprised. We tried for 2 studios vs a 1bedroom and still nothing.
i knew DH wouldn't be happy about this, since he had already prematurely promised his mom the trip and those dates. I told our guide I would have to talk to DH and call him back with what we wanted to do. then he called back just a short bit later and managed to find the full week at BLT lake view. We wanted standard, but couldn't make that happen for us, so we just took lake view. So he did manage to pull something out that MS couldn't.