Last week, Ancestry.com released a free update for the Windows version of Family Tree Maker 2012. It brings the version up to 126.96.36.1996. All three updates are focused on FTM 2012’s syncing capabilities.
* Some important improvements for syncing source citations, relationships, and accepted & rejected hints.
* Resolution of some data issues that were causing sync to fail in some cases
* Sync stability and performance improvements.
There is a note included in the announcement: TreeSync has proved popular enough that at times it overwhelms the online services. It is mentioned that data is safe, but syncing may not take place. They advise trying again in a few hours, and are working to increase the capacity.
You should be able to get the update through the normal FTM software update (built into FTM 2010 for Windows).
Source: Ancestry.com blogs