I have installed Fisheye, but there is no data in the Changelog.
When you add a repository, Fisheye needs to scan through the repository to build up its index and cache. This scan can take some time. Until this scan is complete, you may find that some data is not displayed.
As a guide, Fisheye should be able to process about 100KB-200KB per second on an averaged-size PC. If Fisheye is accessing the repository over the network (e.g. over a NFS mount), then you should expect the initial scan to take longer.