I installed the latest Jenkins 1.457 today on a Windows Server 2003 R2
system.
Was able to configure five different jobs, and it worked fine just calling
CMD scripts, nothing high-tech.

After a system restart or a Jenkins restart, all jobs are gone on the web
page.
However, the five job folders still exist in c:\Program Files\Jenkins\jobs

There are NO "build.xml" files anywhere in the Jenkins directory or
subdirectories beneath it.
The posted workaround doesn't help me, since I don't have a /tmp folder, and
this is Windows, after all.
I'm stuck here, and I really want to like Jenkins, but I can't afford to
lose all my work after the Jenkins service is restarted.

Here's a log snippet, you can see when it tries to load the first job called
"Set_eSF_version":

Mar 27, 2012 9:22:16 PM winstone.Logger logInternal
INFO: Beginning extraction from war file
Mar 27, 2012 9:22:17 PM winstone.Logger logInternal
INFO: HTTP Listener started: port=8080
Mar 27, 2012 9:22:17 PM winstone.Logger logInternal
INFO: AJP13 Listener started: port=8009
Mar 27, 2012 9:22:17 PM winstone.Logger logInternal
INFO: Winstone Servlet Engine v0.9.10 running: controlPort=disabled
Mar 27, 2012 9:22:17 PM jenkins.InitReactorRunner$1 onAttained
INFO: Started initialization
Mar 27, 2012 9:22:17 PM hudson.ClassicPluginStrategy createPluginWrapper
INFO: Plugin cvs.jpi is disabled
Mar 27, 2012 9:22:17 PM jenkins.InitReactorRunner$1 onAttained
INFO: Listed all plugins
Mar 27, 2012 9:22:17 PM jenkins.InitReactorRunner$1 onAttained
INFO: Prepared all plugins
Mar 27, 2012 9:22:17 PM jenkins.InitReactorRunner$1 onAttained
INFO: Started all plugins
Mar 27, 2012 9:22:17 PM jenkins.InitReactorRunner$1 onAttained
INFO: Augmented all extensions
Mar 27, 2012 9:22:18 PM jenkins.InitReactorRunner$1 onTaskFailed
SEVERE: Failed Loading job Set_eSF_version
java.lang.NullPointerException
        at hudson.model.RunMap.load(RunMap.java:216)
        at hudson.model.AbstractProject.onLoad(AbstractProject.java:255)
        at hudson.model.Project.onLoad(Project.java:88)
        at hudson.model.Items.load(Items.java:115)
        at jenkins.model.Jenkins$15.run(Jenkins.java:2437)
        at
org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuild
er.java:146)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
        at jenkins.model.Jenkins$6.runTask(Jenkins.java:838)
        at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)
        at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
Source
)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
        at java.lang.Thread.run(Unknown Source)
Mar 27, 2012 9:22:18 PM jenkins.InitReactorRunner$1 onTaskFailed
SEVERE: Failed Loading job Build only
java.lang.NullPointerException
        at hudson.model.RunMap.load(RunMap.java:216)
        at hudson.model.AbstractProject.onLoad(AbstractProject.java:255)

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