https://forums.autodesk.com/t5/autocad-forum/fatal-error-unhandled-access-violation-reading-0xffffffff/m-p/5439420#M346137 <P>Tried the Wblock method...no joy.</P><P>I have'nt been saving down to an earlier format, this is a drawing that originated in 2012. We have since upgraded to 2015 &amp; need to edit the file...I guess I should have mentioned this earlier (my bad).</P> Wed, 10 Dec 2014 21:14:42 GMT RAMasterson 2014-12-10T21:14:42Z