Clipboard from 2010 to 2009

[PGrimes]

We installed AutoCAD 2010 & Carlson 2010 on most of our systems. My system is still running LDD2009 with Carlson 2010. We have all drawings set to save back to 2007 verison. Now when I open any drawings saved with the AutoCAD 2010 using LDD2009 the clipboard will not work. It says 'invalid' when I try to paste/paste to orig. It doesn't matter if it I try to copy/paste from the current drawing or from another one in. I can have a second drawing window open with a new or old cad file and the clipboard will work in it. If I open a Microsoft Word document and copy clipboard from there it will paste into the saved AutoCAD 2010 drawing. Any ideas?