This problem is in a third party drawing and is something I have never experienced with my own drawings.
I have just noticed the message "Updating Indexes for block *MODEL_SPACE" that appears whenever I do a save of this third party drawing. What's that all about then? I've never seen this message appear in any other drawing. Does this index perhaps store the block displacement setting and therefore explain why resetting "INSBASE" to (0.0 0.0 0.) has no effect on my Lisp routine problem?
Is *MODEL_SPACE an anonymous block?
How do I view this *MODEL_SPACE index - or don't I?