From State EAS Chairman Ed Brouder:
[Some] stations did not receive the FEMA weekly test of the Emergency Alert System on Monday. Upon checking, FEMA discovered a problem unique to users of the 2012 generation of Sage ENDECS. A security certificate expired meaning no further traffic from IPAWS would be allowed through those Endecs. The fix is fairly simple and can be found here.
If your station uses other brands of EAS gear it would be wise to check with the manufacturer to find out the status of its security certificates.
It would also be wise to include a copy of this note in your EAS file in case the FCC stops by for an unexpected visit.