security images not avalable

In my new form in chronoform 7, at the end, before the submit button, I selected the Security / Security Images field.
The problem is that there are no images to see.
In the form you only see the number of selected checkboxes and at "select a cat" I don't see a cat image.

I have reinstalled Chronoform 7 , but there are no images to be seen when setting up the form either.