Im having an issue right now where I can add a 2010 format AutoCAD dwg to the vault and it will populate the block attributes from variables properly, yet if I take the exact same file and save it as a 2007 format dwg then add it to the vault, it won't work. Using EPDM 2012 SP3.
Solved. I had taken a prior drawing and stripped it down to just a title block then turned that into a block with attributes, which should have worked, and obviously worked as a 2010 DWG. I ultimately had to copy/paste the exploded title block into a new, clean, blank drawing and turned it back in to a block. Also had to set SAVEFIDELITY to 0.