I have declared a clearcase label in an environment variable:
latestXsatLabel=XSAT_V04_14
I use this variable in a job's config spec.
The job is configured to Poll SCM every 3 minutes.
A build is triggered every time with the following reason :
[WARNING] CSPEC configured != catcs (view)
REASON: New config spec detected.
It worked fine with plugin 1.3.6 or 1.3.4 (don't remember), ko with 1.4

here is the complete polling log :

Started on Feb 3, 2014 12:44:13 PM
Polling SCM changes on master
Checking if build is running
Checking if a build has already happened
Checking if revision state is known
Checking if we have a build with a valid workspace

• • • • • • • • • • • • • • • • • • • • • • • • • • • get view CSPEC ***********************
                                                      [workspace] $ /usr/atria/bin/cleartool catcs -tag catalogservices_deploy-xsat-packages-and-models_jenkins
                                                      element /vobng/catalog_services/ main/LATEST
                                                      element /vobng/catalog_services/xsat/... main/LATEST

element /vobng/smstk /main/LATEST -nocheckout
element /vobng/smstk/maven/... XSAT_V04_14 -nocheckout

******************************************************************
[WARNING] CSPEC configured != catcs (view)
REASON: New config spec detected.
Done. Took 52 ms
Changes found