rgmanager blocks during startup at "Loading Service Data" in RHEL 6

Issue

• rgmanager doesn't start completely on any of our nodes, and never gets past "Loading Service Data":

Oct 07 10:19:52 rgmanager I am node #2
Oct 07 10:19:52 rgmanager Centralized Event Processing enabled
Oct 07 10:19:52 rgmanager Resource Group Manager Starting
Oct 07 10:19:52 rgmanager Loading Service Data

• We have a cluster of three hosts. Upon reboot, the rgmanager daemon doesn't seem to register with cman, and "service rgmanager stop" hangs, and the rgmanager process can only be killed with a "-9". The rgmanager process doesn't seem to open up a listening port. The last lines in its log upon startup are. In the GUI, the services are seen as disabled.