NMC not displaying current I/O and latency stats for one node in 7-mode HA pair

[DaveM]

I'm trying to figure out why NetApp Management Console View|Logical|LUN  I/O and latency stats end on March 12th of this year on node 2 but are current on node 1. If I go to Operations Manager, it happily displays LUN Bytes/sec for any LUN on node 2 and the monitoring sample is current.  Any ideas where to look?   Server has been rebooted fairly recently, but this problem has been persisting for a long time.

[DaveM]

I am still puzzled by this - Data Collection Status on this node is "Green", Login Credentials "Good", just like node 1. But it will not display any statistics past March.  Does no one have any ideas as to what is wrong here?