I had the same problem with the draworder function not working as well.
Try reloading acad2013doc.lsp file located in c:\Program Files\Autodesk\AutoCAD 2013\Support\en-us.
This seems to have worked for me.
Also, I forgot to mention in my previous post is to make sure that following path is included in the Acad "Support Path":
c:\Program Files\Autodesk\AutoCAD 2013\Support\en-us
I don't think this folder was included in previous version of AutoCAD
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