In Reader 8, is the signature status actually "Invalid" where a Red X icon is displayed, or is it "Unknown" where a question mark icon is diaplayed. Sometimes people mistake the question mark as invalid.
The icon showed is tick mark with a question mark.When i validate the signature in the form,its status is invalid.
RegardsIf I remember correctly from Acrobat\Reader 8, the check mark with question mark icon indicates that the "signature" is valid, but the "user" (who signed) is unknown (not trusted). Try installing the signers certificate into the Acrobat or Reader Trusted Identities.
1) Right Click the signed signature field
2) Select "Show Signature Properties"
3) Select the "Signer" tab
4) Click "Show Certificate"
5) Click the "Trust Tab"
6) Click "Add to Trusted Identities"
If this does not resolve the issue, please uplad a screen shot of the "signature status" information, and or the signed PDF