I also posted this problem. I don't have the ability to run ADT 07 at home, so that takes out some of my overtime. I also have to send & receive dwgs with subs that just can't afford to upgrade when we do. As I posted before, "...I never would have upgraded until I had to open an '07 dwg received." ...and once a dwg on the server is upgraded to '07, it's incompatible with '06, '05, & '04. Readers note this, and try a sample dwg as soon as you upgrade. You may want to wait to upgrade after all. I'm waiting (on my subs behalf) for the enablers.