Reported lengths of frame members can be incorrect after a Frame Generator assembly has been edited using Inventor 2012. Autodesk are working on a fix for this. In the meantime, here is a workaround:-
Edit the offending frame member(s), go to the parameters dialog & alter the parameter G_L as show below.
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".
I know many of you have an iPhones, iTouch or iPad and are often playing with various applications. As many of you know, Autodesk has several applications from Inventor Mobile Publisher, AutoCAD WS, Fluid FX and SketchBook Mobile but there are other great apps that can be very useful when you are working on your designs. Below are a several that I have used in the past and think are great apps to look at.