THE frequency comparator was not working last night, because the als laser noise eater is oscillating.  This can be seen by a large peak in the beat note signal at 1MHz (-8 dBm on the +13 dB preamp output).  With the noise eater oscillating, the noise eater monitor is at 3.14 V.  

Turning the noise eater off fixes the problem, I am going to leave it off.