Dimscale Zero

[mlv]

I notice that in AutoCAD 14, exiting the Dimension Style dialog box often
(and for no obvious reason) resets the Overall Scale factor (Dimscale) to
zero.

A lot of my lisp routines use the current value of Dimscale to perform some
mathematical function, usually division. When Dimscale is zero, the
routines crash out with a 'Divide by zero' error.

I have added a 'Dimscale Zero' error check to my lisp routines now, but my
question is, under what conditions would the Overall Scale factor (Dimscale)
ever be zero? Is zero ever a valid setting?
--
Mike
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