We are in the process of setting up and converting our CAD seats to C3D. I have one seat on my computer, but not totally set up yet, just able to view drawings and make a few edits. The bulk of our work is still be done in LDD 2008. So I open a small survey drawing the other day, make a few text edits, print the plat and sign and deliver. My CAD tech goes to open the drawing in 2008 and all the menus on his GUI are disabled and the drawing does not open all the way. We didn't do a LDD to C3D conversion or anything like that, just opened the 2011 C3D and made some text edits and saved back to 2007 version so we could open in 2008. Any ideas as to why this happened? Is there a setting I am missing to allow us to open drawings back up in 2008 once opened and saved of 2011 C3D?