Hi Andrew,
Based on your e-mail to me and your drawings, it seems you have a point, it seems that one of your drawings stalls AutoCAD.
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EXPLODE
Select object: explode
ALL
*Invalid selection*
Expects a point or Last/ALL/Group/CLass
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Has anyone else seen a drawing that has "Invalid Selection" when attempting to select ALL to explode? Usually, the Explode command just passes over items and says "xxx were unable to be exploded", and moves on, gracefully.
Any ideas out there?
Sorry I can't help, I've tried reblocking the drawing, and copy/pasting it into a new drawing, recovering, purging it etc...
(Maybe Andrew you can strip out any proprietary data from your drawing, and ZIP it and post it to a reply... maybe someone else has an idea, something we've missed!?)
Regards,
Bill