Unfortunately the certificate revoked message still occurs, because there is an issue with the connection to the OCSP responder.
This error is specific to either this system or the Java version used on this machine. I am very sorry, but currently there is nothing I can do about it :(
I hope that future updates will resolve the issue.
A simple work around is to reload the page - the second access usually results in a proper result.
Peppol Practical - created by Philip Helger - GitHub: phax