I believe you are likely using search head clustering and or pooling and the captain is out of synch. To fix this:
Identify your captain:
http://docs.splunk.com/Documentation/Splunk/6.2.3/DistSearch/SHCdeploymentoverview#Check_search_head_cluster_status
Bounce the captain (Splunk Stop / Start)
Confirm your Scheduled searches all have future dates.
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