Why does clearing a signature not activate the script in the postsign event?

Hi,

I have a form with a calculated field to display the record's reference according to out naming nomenclature.

I'd like this field to incorporate the date the form was signed.

I used the script proposed by Stefan Cameron (see http://forms.stefcameron.com/2008/11/05/digital-signature-field-status/ )

This script enables me to assign today's date in a field.

The good thing is the script in the postsign event enables to clear the date field in case the signature is aborted.

However, I was surprised that it would not clear the date field if the form was signed but the signature was cleared afterwards.

Am I missing something?

Thanks for any help you can provide.