Could you post some sample code which produces the error? How do you mean browsing the enames? Through entget? Or is it when you use dictnext/dictsearch?
Sorry .. I was a bit vague.
I get the error accessing the items just about anyway (entget, dictsearch, just browsing in the vlide etc...)
Just this will create the error (cdr (assoc 350 (dictsearch (namedobjdict) "ACAD_MLINESTYLE")))
*Maybe it's an issue related to having both AutoCAD 2013 and 2009 installed on the same computer. Nope ... just tested on another computer.