I started the web interface, used it to hook xiki to emacs, restarted emacs and run into the unfixed "error: el4r-instance is dead" bug.
I stopped using xiki. Maybe I'll give it a try when I'll have time to investigate but it's 2014. There are too many tools battling for mindshare and if something doesn't have a good tutorial and doesn't work out of the box isn't giving a good signal.