Don't recall when this noticed popped up, but it seems different than the one they had been displaying on the Trusted Traveler home page:
The extended partial government shutdown has resulted in a substantial backlog of CBP's Trusted Traveler Programs (TTP) applications and renewals.
Applicants for Global Entry (GE), SENTRI, NEXUS and FAST should expect significant delays in application processing times and limited appointment availability at TTP enrollment centers.
Conditionally approved GE members should seek to complete their GE interviews without an appointment upon arrival from an international flight at any of the 49 airports participating in CBP's Enrollment on Arrival (EoA) program.