jTop Does Not Show Jail Name

I have several jails running on my FreeBSD 9.0-RELEASE server and I would like to use jTop to see which jail is using resources. When I invoke jtop on the host machine as root the Jail column for all processes just shows <dead>.

Am I doing it wrong or is the port broken in 9.0? I've never used it before so I cannot speak to earlier versions.
 
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