Hang while running 'hello world' test in Fitnesse

I'm trying to evaluate Fitnesse to use with our .Net projects. I've been following the instructions laid out in Gojko Adzic's Test Driven .NET De开发者_如何学Cvelopment with FitNesse book and have fallen at the first hurdle. When I run the hello world test on page 19 fitnesse just hangs on the running tests screen.

Has anyone else encountered this problem?

How do I go about debugging issues like this?

I've solved the problem. The syntax was incorrect defining the COMMAND_PATTERN was incorrect. I'd got %p on a separate line.