title: Jenkins polled repository once then never again, though 1 minute interval is set
body: <p>I've set up a Jenkins job and set the poll interval at 1 minute (I used this syntax 0 * * * *).</p>
  
  <p>Looking in the Polling log I can see its reported that a poll call was made as soon as I saved the changes to the job.
  But not over 10 minutes later it hasn't made any other polls.</p>
  
  <p>Any suggestions how I can proceed determining the problem?</p>