@GlinetteC We're already in touch with ProAdvisor support and have reproduced the issue for them on three separate operating systems.  Tier II's response was - "lower your Excel security."

Got that?  Tier II's response was to lower our security rather than Intuit address an expired security certificate.

Support also confirmed that Intuit has reports of this same issue from other customers as far back as June and July - which predates the certificate revocation issue from last month.