What version are you running? Reviewboard 2.0.13 What's the URL of the page containing the problem? http://reviewboard.aicas.burg/r/11677/diff/1-2/ What steps will reproduce the problem? 1. Initialise a Mercurial repository from the attached bundle hg init hg unbundle repo.bundle 2. Configure this repository in Reviewboard 3. Create a review request for rb11677.patch 4. Update the diff of the request with rb11677-2.patch 5. View interdiff 1-2 What is the expected output? What do you see instead? See screenshot. The diff viewer identified a move from line 207 to line 153. It does this even though the order of the lines in the block was changed: the old line 208 is different from the new line 154! What operating system are you using? What browser? MacOS X 10.7.5, Safari 6.1.6, Reviewboard runs on CentOS Linux release 7.0.1406 Please provide any additional information below.