Autodesk have released a hot fix (TS16673759) for Vault 2012. This primarily fixes migration issues, but other problems are corrected here as well. Be warned, this is a server fix, so ensure a reliable backup beforehand.
My opinion on this is "If you have no immediate requirement to move to Vault 2012, then wait until back patches to previous version of Autocad & Inventor are available".
Dave Whiteley, Technical Director