I recently updated to Inventor 2012.
I have an iAssembly made of two iParts. In this iAssembly, I constrain one of the iPart's Origin planes to one of the other iPart's Work Planes (work plane is through a point, parallel to an origin plane). After conducting a little test, it APPEARS (really not sure at this point) that Inventor 2012 does not pull an iPart's work planes into an iAssembly...? The end result, is I now have 400+ drawings which have lost their dimensions, due to this constraint conflict.
Help?
Update: OK, found the planes... looks like the default browser viewing option changed... something like that. In any event, I have my work planes. Also tracked down the true cause of my iAssembly and associated drawings exploding... coworker accidentally deleted the iPart from the iAssembly, added it back, reconstrained everything (without iMates)... and... well... yeah, guess what? It broke. /sigh God bless the ITs.