Why does my git svn-diff output more than git diff?

Question

Hi,

So, I'm using this script: http://mojodna.net/2009/02/24/my-work-git-workflow.html which creates svn-like diffs from git for use in ReviewBoard. The thing is, running git diff produces no output, but git svn-diff produces a huge output (files that HAVE changed, but not recently).

I've created a local branch from the remote branch and if I run git diff and git svn-diff on the remote branch the output is the same. So, why would git svn-diff show changes where git diff doesn't and how can I stop it happening!

Thanks,

Mike