Autodesk finally released its backwards compatability to an older Inventor release for the newest version of Vault. This patch with adjust Inventor 2011 to accept integration to Vault 2012 products. This will help your new upgraded Vault to talk to your older Inventor so if you are still working on projects in both Inventor 2011 and 2012 you can still use all the benefits of the new Vault.
There are two versions of the hotfix, one for those without the bonus pack:
...and one for those with the Bonus Pack
Keep in mind you must also have patched Inventor to at least Service Pack 2 which was released just recently.
Also to note, there is a now a new Fusion 2012 Service Pack as well that included a slew of fixes and updates.