Update Set stuck in PreviewingIssue When the user tries to retrieve an update set from another instance, by default it should try to preview once retrieved if the "glide.update_set.auto_preview" property is set to True. However, this can sometimes get stuck in the Previewing state, and the preview cannot be canceled.CauseUpdate sets can get stuck previewing after being remotely retrieved because the scheduler is not running. Check the Scheduled Jobs. Previewing an update set creates a scheduled job, and the job has to run to create the preview. If the scheduler isn't running, you should see a Scheduled Job for "Generating Update Set Preview for: (update set name)" with a time value in the Next Action field that has already passed. Attempting to force the job to Execute Now will fail, and instead set the Next Action time to 31-Dec-1969 07:00:00 PM. If you have ServiceNow Overwrite, you can check the status of the app node, and it will say "Missing threads: glide.scheduler": ResolutionVia a Support NOW case, you can request a node restart to solve this. Restarting the node will make the scheduler thread restart, which should then pick up and clear the upgrade preview job. Once the upgrade preview job is gone, you will then need to delete and retrieve the update set again.