Honestly.... you are trying to reserve a DIFFICULT week and you should have problems. If you didn't want a floating week system you should have bought into a fixed week system. I did not want a fixed week system so, I choose Marriott. The week the OP is trying to reserve is not a difficult week. So, there is another issue and it has to be with her account or something like that. I just don't believe those weeks are already reserved. Maybe if she was trying for Spring Break or the Indian Well Tournament then, I'd be more incline to understand but January.
And, I totally disagree with your last statement as an owner I feel I have the right to do whatever I want with my week. There should be no priority given to owners based on how they want to use their week. Besides how would you determine what you want to do with your week 12 months out. There have been many times I've reserved my week 12 months out and then, decided at 6 months we are going to rent. That is the joy of owning a Marriott I have other options if I don't want to use the week I reserved. That's why I like Marriott.
It's just frustrating to not be able to use your week as you want.