Just upgraded to Hudson 1.210 and FB plugin 2.4. We now get the following
error in the log file every build, and the user-visible result is that the
trend graph always shows the "red x" suggesting the page is broken.

[#|2008-04-24T15:07:18.478-0700|SEVERE|sun-appserver9.1|javax.enterprise.system\
.container.web|_ThreadID=21;_ThreadName=httpSSLWorkerThread-80-1;_RequestID=50b\
61c80-f515-423a-a888-41b45a648c14;|StandardWrapperValve[Stapler]: PWC1406: Serv\
let.service() for servlet Stapler threw exception
java.lang.ClassCastException: java.lang.Object
at hudson.plugins.findbugs.FindBugsResultAction.buildDataSet(FindBugsRe\
sultAction.java:142)
at hudson.plugins.findbugs.FindBugsResultAction.createChart(FindBugsRes\
ultAction.java:125)
at hudson.plugins.findbugs.util.AbstractResultAction.doGraphMap(Abstrac\
tResultAction.java:150)
at hudson.plugins.findbugs.util.AbstractProjectAction.doTrendMap(Abstra\
ctProjectAction.java:182)
at sun.reflect.GeneratedMethodAccessor2198.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcce\
ssorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:1\
03)
at org.kohsuke.stapler.Function.bindAndinvoke(Function.java:57)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:69)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher\
.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:416)
at org.kohsuke.stapler.MetaClass$15.dispatch(MetaClass.java:369)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:416)
at org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:248)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher\
.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:416)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:352)
at org.kohsuke.stapler.Stapler.service(Stapler.java:112)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)