If you are using Inventor Fusion that came with your Autodesk products please ignore...
If you downloaded Inventor Fusion 2012 from the labs site; we have updated the site with a new version that includes SP3. This delivers important fixes in translators and controlling visibility with multiple components. Thanks for your continued interest and support.
Link to the download is here.
-Kevin Schneider
Autodesk, inc.
Kevin Schneider