How do I find out why my SVN tagging is failing?

I just set up a new build copied from an existing build and the tagging is not working in the new build. It was working fine in the old build. I believe that I could solve this if I only knew what the problem was. I cannot find any information on the problem in any logs on the server or agent. Perhaps I'm looking in the wrong place. Specifically I was looking in:

server:
TeamCity/logs/teamcity-vcs.log
TeamCity/logs/teamcity-server.log

Agent:
teamcity/logs/teamcity-agent.log

Any help would be appreciated.

Thanks.

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Matthew Jaskula