Going into the properties of a previously completed migration session and clicking "View log" button produces the following message "An error occurred on the last operation. Please see the QMM log file for more details". When details are expanded, there is another message "The RPC server is not listening".
When viewing the session log, Migration Manager tries to contact the DSA agent that was used for this migration session in order to display the necessary data. If this host is not reachable, an RPC error above is returned.
Check if there is or was more than one DSA agent installed. Go into the properties of migration session, Summary tab and check Agent: Hostname entry in the list of settings. This hostname should successfully resolve on the QMM console and Migration Manager should be able to contact this server. If the agent was not uninstalled and the server is running, consider adding a corresponding hosts entry on the console machine.