RollbackExecutor pauses the cluster for every rollback execution. This is excessive as it is only necessary to pause the cluster for upgrade rollbacks. Pausing the cluster causes certain platform features, such as previewing/committing update sets, to be disabled.
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If you are certain the cluster is not paused for an upgrade or upgrade rollback, you can un-pause the cluster by running
gs.resume(); from the Scripts - Background module.
Check sys_rollback_context for records with a state of "Reverting" to see what is being rolled back. To verify there is no upgrade in progress, check the Upgrade Monitor module and the worker threads on all nodes.