If no jobs seem to be running or completing in the job queue, ensure that the Quest One Identity Manager service is running on the job server designated as the "AD synchronization server" in the master data for your domain.
If the account used for the service becomes locked out, or the password changes, the service may stop unexpectedly.
For frozen jobs, please refer to Knowledge Article 123342
, How to troubleshoot “Frozen” jobs in the job queue (JobQueueInfo.net)
For additional troubleshooting please refer to Knowledge Article 123332
, Identity Manager troubleshooting steps and required information