I can't tell you if this is the problem you are having or not, but Microsoft did release a windows update which tightened some of the processing of SSL. This affected some certificates which had worked prior to that update. If your application worked but then stopped, see if you can correlate the da...

Reader is all that is needed to validate signatures. It sounds like you have not established a trust relationship with the signer successfully. In Reader, go to Document > Manage Trusted Identities and then select the Certificates display. Is the signer or the issuer of the signer's certificate list...