It's confusing when choosing a format of review.

The exact steps you need to get it to work (when using Fisheye):

1. Go to Create New Review in Crucible
2. Under the Manage Files, select a fisheye repository and an Add to Review as type
3. You need to select the drop down first before selecting the file otherwise it won't work
4. E.g do a "diff to" between revision ID 29 and 42 like this. I would expect the result like this. However, if you select the file before selecting the drop down list, Crucible will show the latest review like this
5. See the results in the "Review" tab