A proven (Electronically signed Document) only shows a blue square in that field.

This occures for only one single user. Everybody else, it works fine. They can all see the electronic signature, as per normal.

For that user; I re-installed AAP. And after that, it still does the same.

What could possibly impact that single user in such a way? In the field where normally is found a  Digi sign, for her is just a Blue square in that field.

any thoughs or feedback appreaciated.