I'm working AutoCad 2000, this started a couple of weeks ago. I can't copyclip or pasteclip and create blocks or wblocks.  I'm puzzled, sometimes it lets me and sometimes it doesn't.  Is there anyway I can check my clipboard to see if it's full?? 
 
 

The files may be saved from AutoCAD 2007 - see:
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=5077