A few people are running into problems with this general sequence of events: 1. Create a diff using the wrong command (e.g. creates a context diff or htmldiff) 2. Use the "New Review Request" form to post a review, giving change number and broken diff. 3. See error, come complain to me and ask how to create the diff. 4. Create proper unified diff. 5. Use the "New Review Request" form to post a review, giving change number and not-broken diff. 6. Get an error that the change number is already in use. We should let this form update an existing request if it needs to.