There seems to be a new feature (since 1.3.9) that re-builds a job whenever the config spec has changed. It's very troublesome; it's not always desired. User may want to prepare a config spec that he/she wants to be run later, not just instantly.

Moreover, there's a bug in this functionality: when using automated time rules, current set CS is constantly different that the one configured. So the result is rebuilding constantly .

After those 2 latest issues, I strongly recommend to remove the latest pull request at all https://github.com/jenkinsci/clearcase-plugin/pull/11 since it creates plenty of blocking issues. With these many breaking changes, I'm afraid that my project and I would need to stay with the 1.3.8 indefinitely.
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This page captures the polling log that triggered this build.

Started on Sep 17, 2012 2:39:01 PM

• • • • • • • • • • • • • • • • • • • • • • • • • • • get view CSPEC ***********************
                                                      [workspace] $ cleartool catcs -tag my_view
                                                      time 17-sep-12.11:53:51utc+0000

1. Removed [...] config spec rules
   element * /main/LATEST
   end time
   ******************************************************************
   [WARNING] CSPEC configured != catcs (view)
   REASON: New config spec detected.
   Done. Took 58 ms
   Changes found