PDF-XCHANGE valid signatures marked as UNKNOWN

[hairymarmite]

Hi there. I have updated to 10.7.3.401, and I went to verify a signature.
My previous version was marking this as Valid when validating, but the new version is stating it is UNKNOWN.

Status: Signature validity is unknown.

There doesn't seem to be a reason given and the individual certificates state the the validation path is valid.

Adobe states all signatures are valid.
I wondered if there is an obvious answer, that I am missing....
Thank you for your time

M

[Dimitar - PDF-XChange]

Hello hairymarmite,

This message appears because the signature issuer is not included in the trusted list accessed by our PDF Editor.

We are working on improving the verification process in upcoming builds to prevent this issue from occurring in the future.

Best regards.