I'm setting up my new Ubuntu 10.04 server and installed munin to view my machine's stats. It was working for a while, then I changed a couple of things (PHP spawn-fcgi to PHP FPM, reinstalled nginx) and now the graph history doesn't work.
I can see the current state, but no history on the graph:
What my munin graph looks like (sorry I can't post inline images due to reputation restrictions)
What should I do to fix it?