I used job-exporter (https://wiki.jenkins-ci.org/display/JENKINS/Job+Exporter+Plugin) plugin with Jenkins v1.426 and it worked fine. But yesterday I upgraded Jenkins to the latest version (1.433) and now, the plugin doesn't fill each variable in the properties file. If a user start a job the output is like this:

#created by com.meyling.hudson.plugin.job_exporter.ExporterBuilder
#Thu Oct 06 14:06:55 CEST 2011
build.summary=Executor #3 for master \: executing xxxxxxxxxxxxx #48
build.number=48
build.id=2011-10-06_14-06-33
build.hudson.version=1.433
build.admin.emailAddress=address not configured yet <nobody@nowhere>
build.jobName=xxxxxxxxxxxxxxx
build.cvsBranch=

so the build.user.name parameter (and some other) is missing.