After some changes to a remote hub the queues that are set to send to the primary have a status of red and are no longer draining.
Release: Component: UIMHUB
Go into the hub configuration on the primary and disconnect/reconnect all of the hub queues from the problem hub and then apply the changes. Verify if the queues go back to green and start to drain to the primary.
You can select the GET queue > right click Edit > use the Address drop down list to select the queue at the remote hub > OK.