The validate on open preference should be on by default, but it wouldn't hurt to check.
- Select the Edit > Preferences menu item
- Select Security from the Categories list box
- Make sure the Verify signatures when the document is opened checkbox is selected
- Click the OK button on the Preferences dialog\
This did not work for me.
Is there another option/way/process?
If the Preference is selected as noted above there has to be something else that is preventing the signature from being validated and without seeing the file I wouldn't know what it is. When you validate manually does the signature come up Valid?
When I validate it, I do see a green check mark indicating the signature is valid. But, when I save then reopen the document, I get the same message about '1 signature required validation.'
Would you like for me to email you a sample file? I am very desperate .