(quote)
I can see the device using udevinfo and I can mount it as
root manually, but why won't volume-manager work anymore?
(end quote)
Did you look at the actual device nodes in /dev to see who "owns" each device? If user:group=root:root then you need to read through the /etc/udev{,/rules.d} files to find out why your devices are not being given the desired group ownership.