I have a full account and have for a while. The buttons aren't greyed out - what happens is that I click them, and they get stuck in the state of depression. To see what I mean, go into a sys pref and click and hold a tab - it gets a little darker, and when you let go, it loads the tab. For me, they just stay darker, and don't bring up the tab. This happens with the Sync tab and the Advanced tab.