My tests were done without online validation (I have disabled OCSP), so I would say that discards it as the cause. That said, I'm still getting the invalid certificate alert, and scanning the certificate using
this service yields this:
Quote:
The certificate is not trusted in all web browsers. You may need to install an Intermediate/chain certificate to link it to a trusted root certificate. Learn more about this error. You can fix this by following VeriSign's Certificate Installation Instructions for your server platform. Pay attention to the parts about Intermediate certificates.
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...which is in line with the symptoms described by the OP.