CGFI is a possibility depending on where it is in the circuit.
When I have this problem it's usually a breaker that is associated with the slider control unit and converter. It's a small inch and a half long black device with to wires connected. It has a micro switch to reset it. Then the power comes back.
Another possibility is the wiring for the converter. On mine a couple of times the wire nut for one of the incoming 120V lines came loose. This killed the power because the it didn't allow the 120V power to get to the receptacles.