Debugging suggestions?

I've got several cruisecontrol boxes, but one of them keeps getting stuck when it's detected SVN modifications. The last output would be of the form: ModificationSet - 316 modifications have been detected and then it stays there until I kill the SVN process. After killing the process it goes on and completes the cycle, the only problem being that it shows the label as UNKNOWN. 

I'm running cruisecontrol 2.7.1 on Windows 2008 x86. I've updated to the latest tortoiseSVN and blown away all the sources and got them all again from SVN. 

I think the problems started when we were having some network issues - our repository is offsite. 

Can anyone suggest ways to debug why it's getting stuck? I don't even know what SVN command it's executing. 

Alternatively is there anything else to cleanup? Like for example how does it know how many modifications there are even if I blow away the sources - where's that information stored?! 

Keith

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