I upgrading all our lisp routines to 2013. I have a routing that modifies a block attribute. Then ENTMOD returns with the proper information. ENTUPD reurns the same enity name. The block never changes. The same routine woks in 2010.
Figured it out. It is still a little quirke the attibute's text style was SIMPLE instead of SIMPLEX.It never caused a problem in previous versions. The routine was blanking out the textstyle so the attribute was not showing up.