svn diff through SSH - not same results as Trac?

Greetings,

I'm trying to generate a diff for a revision from a remotely hosted SVN repository (hosted with codesion.com). If I view the diff/changeset through Trac, i can see the changes made in t开发者_开发技巧he revision. But if I'm trying to generate the diff through SSH i get no results (it gives results for other revisions though). Any ideas? Has it got something to do with the revision containing binary/non-text files?

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I was attempting to use svn diff -r 45 URL to get changes between revision 44 and 45 in the remote repo. Using svn diff -c 45 URL works perfectly.