I am experiencing the same issue. I have a ClusterXL deployment with two members, cp1 and cp2. I successfully upgraded the management server to R82 without any issues. Following that, I upgraded cp2 (the standby member) via CPUSE, after which I encountered the following errors:

At this stage, should I proceed with upgrading cp1 (the active member), or is there an additional step I need to perform first?
I also enabled MVC on the upgraded member (cp2), but the same errors continue to appear in SmartConsole.
cp6-2> show cluster state
HA module not started.
Cluster policy should be installed - please run cphastart
cp6-1> show cluster state
Cluster Mode: High Availability (Primary Up) with IGMP Membership
ID Unique Address Assigned Load State Name
1 (local) 10.11.12.1 100% ACTIVE cp6-1
2 10.11.12.2 0% LOST cp6-2