Membership Access quit working

Up until 2 days ago my membership configuration was working just fine. People registered, we moved them to a registered user group and they could get to protected content just as advertised.

All of a sudden, with no changes whatsoever, I start getting users telling me they cannot access Classifieds, Equip Rental (Appointments+), Members, etc. Finally trace it down to the fact that Membership is not allowing users to access content.

The attached screenshot shows the user logged in (upper right) but the Membership plugin telling the user they are not allowed to access the content because they are not a registered user.

Looked through other threads and found posts that were similar but not real answers.

Please help.