Several of my 2008 users have the exact same problem, although the 2006 and 2007 users seem to be exempt. Shortening the path is always good. The AutoDesk Support page also recommends setting BACKGROUNDPLOT to 1 in the offending plot setup, but I don't know how much good it does. A Map 3D user in another discussion group said he "queried the problem drawing into a new drawing" which worked for him; but I don't seem to have Map 3D in my AutoCAD, so it does me no good. AUDIT, PURGE,RECOVER and WBLOCK have no apparent effect on this problem. Sorry I can't be more help.