Hi,
I installed the profiler according the manual the jboss sa starts ok.

When trying to invoke:
java -jar jboss-profiler-client.jar snapshot

I get:
19:04:05,734 ERROR [ServerThread] Worker thread initialization failure
java.lang.ClassNotFoundException: No ClassLoaders found for: org.jboss.profiler.shared.Command
at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)

My environment:
Windows XP
Jboss 4.2.3
jboss-profiler-2.0.0.Beta5