Exception invoking org.freedesktop.PolicyKit1.Authority.CheckAuthorization

[peasthope@shaw.ca]

Since a recent update to Squeeze, connecting a USB store 
yields this popup.

Not Authorized: Remote Exception invoking 
org.freedesktop.PolicyKit1.Authority.CheckAuthorization
() on /org/freedesktop/PolicyKit1/Authority at name 
org.freedesktop.PolicyKit1: 
org.freedesktop.DBus.Error.ServiceUnknown: The 
name org.freedesktop.PolicyKit1 was not provided by 
any .service files

What does CheckAuthorization(?) want to see before the external device 
can be mounted?  A simple change in /etc/something?

Thanks,              ... Peter E.