Upgrading to v1.473 has broken all my matrix jobs

[Thomas Fields]

Hi there,

I just upgraded to Jenkins 1.473 and I'm getting this for all my matrix jobs:

SEVERE: Failed Loading job PhyreAssetPacker-Live
java.lang.NullPointerException
        at 
hudson.matrix.MatrixProject.updateTransientActions(MatrixProject.java:431)
        at hudson.model.AbstractProject.onLoad(AbstractProject.java:296)
        at hudson.matrix.MatrixProject.onLoad(MatrixProject.java:466)
        at hudson.model.Items.load(Items.java:115)
        at jenkins.model.Jenkins$17.run(Jenkins.java:2492)
        at 
org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
        at jenkins.model.Jenkins$7.runTask(Jenkins.java:878)
        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)

Anyone know what the problem might be?

Cheers,
Tom.