I experienced this myself on my system most likely due to all the pre-release versions of products I had on my machine and various version of files and file name conflicts. The issue is the Autodesk 360 icon would error on my system tray frequently. I had been working with the QA & software development team on this to research it.
There is now a hotfix available for Autodesk 2013 products to solve this but make sure to read the ReadMe and sign-out of Autodesk 360 first from your app before installing the hotfix.
Hotfix – Persistent Autodesk Sync error in the system tray
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=19683742&linkID=9242539
Hope this resolves the issue you may be experiencing.
Shaan
