Hi Jeff,
I replied via email as well.
For your first issue where signatures are not showing up, please check the permissions on the signature images picture library and make sure that everyone has Read access to that.
For the signature issue, this must be two issues:
- SharePoint PIN list is not restricted to prevent read from others - the steps should have been documented on this
- The rule on the PIN text field needs to correctly set display status so that the signature image only shows if PIN matches what's in the SharePoint image list
Fixing the first issue will enforce permissions since it will only allow the person who has the image to read it.
Patrick