Excerpts from Mike Gahagan's message of 2014-03-01 07:49:06 +1000:
I can't see the system page on your demo site currently (getting 500 errors) so going off of memory from a couple of days ago...
Sorry about that. The demo is hosted on Red Hat's "OS1" OpenStack instance, which is not really production quality yet. It looks like the VM got some I/O errors on its virtual disk. I tried rebooting it but now it has gone AWOL. I will try and either rescue it or just reprovision it from scratch.