jenkns version 1.467 problem:
project uses rootPOM path spec such as parent/child/pom.xml if you edit job config after change rootPOM entry looks fine after jenkins restart, if you edit job config now, rootPOM entry looks empty, despite appropriate entry is present OK in job/config.xml and job builds fine; if you now merely edit and save job config, the rootPOM entry is lost in job/config.xml and job does not build any more
