[lxc-devel] Starting/Stopping container causes host instability - FC15 host, Centos 5.6 guest

I've installed LXC from GIT on a vanilla FC15 installation. I've not explicitly mounted cgroup because the distro seems to be doing it automagically and (as far as I understand it) the recent patches should mean this works. I've then followed the instructions here: http://www.emanuelis.eu/2010/05

[lxc-devel] cgroups: support cgroups mounted in multiple places (v3)

I seem to be having this same issue in a Scientific Linux 6.0 (RHEL 6 clone) installation with lxc-0.7.4.1 lxc-checkconfig seems to think everything is OK, but when I try to lxc-start a container I've created, I get this error message: lxc-start: no ns_cgroup option specified lxc-start: failed