I've had fisheye installed for a few days now and I've restarted it several times. I set up a SVN repo (hosted at http://codesion.com/) and it connects okay but for days has been stuck on "getting difs" or "Created changeset 1" and the status has been 'scanning' for days. The source only shows the very first check-in ever done and it hasn't been able to get anything more recent.
What should I look for to fix this?
Try creating a local clone of the repo using svnsync or svnadmin dump and load. Then have fisheye scan it using the file:// protocol, when it's up to date you can switch back to the remote repo.
But "scanning for days" is pretty much standard fisheye behaviour in my experience, particularly if you have many tags/branches.
As an update, my current client has just decided to drop Fisheye. Whilst we love what it does, it simply doesn't scale on large repositories and hence is functionally useless to us. FWIW, the repo that is the problem for us is around 75Gb and it started to struggle when we hit 200,000 revisions. With 350,000 revisions it because unusable, and although Atlassian took an interest, they have not been able to fix it.
If you have a large number of revisions in your repo, I hate to say it, but you might need to look elsewhere.