Indeed, this worked for correcting objects position. All materials gone though. Still, there is a drawback: Max instances will be moved to the origin of the original instance and so it will be imported into SU, no matter if the DWG and the new MAX files show them up correctly positioned. It might as well come to a "kill instance / export / undo kill instance" action.
Thanks Juan, it helped. I had already noticed that the 2007 export filters worked and the newest didn't; yet, it's still a bit annoying; I'll try OpenCollada and report back.