If a system is removed from the distributed reporting cluster, and then re-installed as a different type (Console vs Poller), using the same names, then the machine_id tables of all the cluster members will have the incorrect information about what type of eHealth system that server is.
To force eHealth to check and update the machine ID table, correcting the machine type, do:
nhUpdateClusterTable -host <host ID>
Where hostID is the cluster member to be updated. Repeat for all machines that need to be updated.