For anyone having issues with Google Chrome on Windows 7, this is the fix for me too. I just downloaded the .der file from there, and put it on "Third Party Root Certification Authorities" (o "Entidades de certificación raíz de confianza", en español).
Do that, restart the browser, and that's it.
Prior of that, I deleted the X3 certificates from the intermediate window, don't know if that's something required to do or not.