Be careful! On 2/18/13, I got a similar message: "The last sync failed. An error occurred while "Analyzing file...".
You may want to restart FTM and try again later." When I tried to restart, my local file was gone! I did proper searches of my entire computer, including a time search in case the file was renamed somehow. Nothing! Now I do manual syncs only, and only immediately following a backup. In addition: I will never use the online version to restore my file (that's what I tried first) - too many things were lost as compared to my local file because the online version can't/doesn't handle (e.g., media categories, and links via the media window to people and facts). Syncing worked for me for a long time, but losing a local file is scary!